Expert answer

Hi Leslie,

It's much better than hybrid Toyotas used to be for sure, though it still makes a bit of racket when you put the accelerator pedal all the way down for maximum performance. And it'll be noisy for short periods of acceleration as well, for example when joining a motorway.

But it's fine when up to speed and even at motorway speeds. And it drops into fully electric mode in stop-start traffic a lot so there's no issue there either.

Go test drive one for yourself before you commit to buying it though.

Expert answer

Hi Dee,

Hybrids such as the Juke have very small batteries and can therefore only drive on electric power for very short distances. If you're in stop-start traffic, it might use the battery for most of the time, but if the traffic is free-flowing and the speeds are higher, then it will not.

Unfortunately, the Juke Hybrid does not give a readout showing how much time is spent using the battery alone so you can't monitor it accurately.

If you drive slower, the car will use the battery more in town. Likewise, less use of the heating or air conditioning should mean less need for the engine to start up.

Bear in mind through all this that most of the energy used to charge up that battery comes from the engine itself, so it's not free energy.

Choose the Eco driving mode for maximum efficiency, but really, it will come down to your driving style as much as anything else.

Expert answer

Hi Mike,

Citroen does not publish such a figure as the C3 Aircross is only a 'mild' hybrid. In reality it only moves on electric power when manoeuvring or in very low stop-start traffic speeds.

Expert answer

Hi Marnie,

It could well be that the wrong type of battery was used, so perhaps take a look at that, but there can be many other reasons causing the stop-start system to give an error. Really, it needs to be plugged into a diagnostic computer to get to the bottom of the problem. A good mechanic should be able to do that for you.

Expert answer

Hi John,

You've not mentioned which gearbox specifically, so we'll assume you mean the DSG automatic. These can develop faults with the 'mechatronic' unit that controls gear shifting etc. If that has to be replaced then it's expensive, though sometimes just changing the transmission fluid helps.

That needs to be done regularly in DSG units using the 'wet-clutch' setup. Those with the dry-clutch system don't need such maintenance.

If you've thinking about buying a car using a DSG transmission, then make sure you take it for a decent test drive through the full speed range up to motorway speeds and monitor the gear changing for judders or other issues. If possible, spend some time in stop-start traffic as well as that can cause the clutch packs and mechatronic unit to overheat if they are weak and you'll soon notice if something isn't right.

Saying all this, the DSG transmissions aren't necessarily bad designs, you just need to ensure the one you're buying is still operating properly.

Expert answer

Hi Gerry,

We do try to observe and mention real-world fuel consumption in our reviews, when possible, though the launch routes aren’t always very representative of the real world and sometimes are too short to get a proper feel for such things.

There’s no doubt that a car’s economy varies massively depending on where and how it is being driven, though I am a little surprised your Octavia hits nine litres per 100km at times. That sounds a little high. Maybe mention it to the garage next time you get the car serviced so they can look for any issues.

(The Skoda Octavia review can be found here)

Expert answer

Hi Catherine,

Stop-start systems can be tempermental. We get so many queries about them that we decided to write a feature explaining the potential issues - Why won't my car's stop-start system work?

Nonetheless, issues with it are regularly caused by weak batteries. Saying that, I wouldn't expect your car to start properly in the morning if there was a big battery problem, so I don't think the boot opening problem is linked to the battery. The Fiat 500 has a known issue where the wiring near the tailgate hinge can become damaged or broken - I suspect that's where your problem lies.

A decent mechanic should be able to quickly fix that for you.

Expert answer

Hi Teresa,

We used to get so many queries on this subject that we published a feature called Why won't my car's stop-start system work?

If you read that you'll discover that the systems are highly sensitive to battery charge and load, even when working perfectly. Could it be that you often have high-load items switched on? Things like heated seats, air conditioning, rear window demister, that sort of thing.

Now, in a DSG-equipped automatic car, you shouldn't need to put the car into neutral to get the stop-start system to work - that's only on manual cars. You can leave it in D (drive). What does affect it, however, is how firmly you are holding your foot on the brake pedal when at a standstill. Sometimes it's necessary to give the brake pedal a firm push before the engine will cut out.

Other things to watch out for: if you move the steering wheel, it is likely to cause the engine to restart. And if you're in the Sport driving mode or you've selected the Sport gearbox setting, then stop-start might not work either.

If none of the above changes your experience, I suggest getting a mechanic to come out in the car with you to check it over and observe how you drive, and then let them do the same.

Best of luck with it - come back to us and let us know how you get on.

Expert answer

Hi Justina,

Start-stop issues are common with a lot of cars and we get many queries about it. If your car is not being used much right now, then the battery may not be in great condition and that's a leading reason for stop-start problems. It could be something else of course. Your car should still be under warranty if you want to talk to your Hyundai dealer about it.

In the meantime, read Why won't my car's stop-start system work? on the subject.

Expert answer

Hi Ricky-Lee Morgan,

In the vast majority of cases this is down to either a battery that is not in perfect health or a dodgy sensor. See our feature Why won't my car's stop-start system work? and if that doesn't help then you will need to get the car plugged into a diagnostic computer by a mechanic.

Expert answer

Hi Ann,

We'd suspect the battery or alternator aren't performing at their best. Stop-start issues are very commonplace, across all cars. So much so that we've written a feature for drivers on the subject: Why won't my car's stop-start system work?

Expert answer

Hi Tanya,

It sounds to us like the alternator may have been struggling to produce enough electrical power and that perhaps your battery could do with replacement. If the problem has not reoccurred then it's nothing to worry about, but no harm getting your battery checked before winter sets in.

Expert answer

Hi Brian,

We get so many queries about stop-start systems (in all makes and models) that we wrote a feature about it: Why won't my car's stop-start system work?

However, in your case, perhaps there's something up with the alternator that prevents it from charging up the battery fully. 

It may be worth getting an auto-electrician to check it out.

Expert answer

Hi Tina,

There can be many different reasons for a start-stop system not to work. We get so many queries about it that we wrote this feature: Why won't my car's stop-start system work?

Expert answer

Hi Wendy,

We get a lot of queries from people with cars that have stop-start issues. We've published this article to help: Why won't my car's stop-start system work?

Saying all that, we also know that the Fiat 500's engine can develop a couple of issues that may be relevant to you, including a problem with the alternator belt tension (and hence battery recharging when on the move) and another with the engine control unit.

Sadly, unless you're comfortable with checking the alternator belt for yourself, these items will have to be checked by a mechanic. 

Expert answer

Hi Gerald,

Most stop-start issues can be traced to a problem with the battery. Perhaps with such low mileage it isn't being kept topped up. Regardless, we suggest you read the feature we wrote about this, called Why won't my car's stop-start system work?

Expert answer

Hi Andres,

Stop-start systems regularly stop working. So much so that we've written a guide on the subject: Why won't my car's stop-start system work?

Expert answer

Hi John,

There's a lot less going on in the exhaust aftertreatment of a modern petrol engine than the equivalent diesel so I suspect the diesel needs the warm-up more. It may also be due to the extra strain on the starter and battery due to the high compression of the diesel engine. When the oil is cold, the friction may be higher, causing a higher strain again. 

Either way, it's nothing to worry about.

Expert answer

Hi Sue,

Sounds to us that the battery could be in poor condition. Lots of cars develop issues with their stop-start systems. We get so many questions about it that we wrote a feature about it all - Why won't my car's stop-start system work?

Expert answer

Hi Dave,

I'm surprised to hear that from a new truck where the battery will be in good condition, but stop-start systems regularly don't work as people expect. The system measures loads of variables before deciding whether the engine will be stopped, including the temperature of the engine and even the outside temperature. If it's cold weather, it may not work at all. If you're using items that are a big electrical drain, it may not operate. 

Read our Why won't my car's stop-start system work? feature

Expert answer

Hi Sherry,

It should not, no, though you are likely to get a warning light in the dashboard.

Read our Why won't my car's stop-start system work? feature on why that might be happening.

Expert answer

Hi Sandra,

It shouldn't cause any damage, but it could indicate a weakness in your battery or electrical system, so it's best to have it looked at when you can. 

Read our Why won't my car's stop-start system work? feature for more information

Expert answer

Hi Pat,

We certainly have noticed this trait in all Volkswagen Group DSG-based gearboxes (that's what the S tronic transmission is) and their attendant engines of late. The only explanation seems to be that VW’s various brands have trimmed back both engine power and responsiveness at low speeds, and especially at idle or when waking up from a stop-start cycle, in order to optimise their figures in the new WLTP emissions and economy tests. VW is certainly not the only one to do this, but it does seem to be more obvious with VW Group models than with some other manufacturers. Shifting the gearbox into Sport helps a bit, but it’s not a total fix.

One cure might be a total vehicle upgrade — we’ve noticed that the new ‘Evo’ versions of the 1.5 TSI petrol and 2.0 TDI diesel engines are noticeably less sleepy. Or, alternatively, trade in for a version with a manual gearbox — that is the simplest cure of all.

Expert answer

Hi Tahir,

The first thing we'd check is the condition of the battery. It sounds like the system is turning off the engine as normal, but then sensing that it needs to go back on right away. That's unusual, to be honest, as most systems just won't turn the engine off if an issue is detected. I'd advise you bring the car to a good mechanic or auto-electrician to have it looked over.

Our feature, Why won't my car's stop-start system work?, is worth a read as well.

Expert answer

Hi Nathan,

Generally the Ford 1.6-litre diesel (also used by Mazda, Peugeot, Citroen, Volvo and MINI down the years) is a rugged and reliable unit, but there are a few things to bear in mind. First off, this is an engine that needs a regular diet of high-grade synthetic engine oil, otherwise a nasty sludge can build up in various parts of the engine, choking performance. Make sure you check the service history to ensure that a good quality oil has always been used. The stop-start system can occasionally cause starter motor issues, especially if the car has mostly been driven in town. If it has been mostly driven in town, or has very low mileage, be wary of potential issues with the diesel particulate filter, too.

Expert answer

Hi Harry,

The most likely culprit is that there’s some electrical item draining the system as you’re driving. Or, possibly if you’re only driving for short hops, the engine is still in its warm-up phase and can’t be shut down by the stop/start. Or, and this is a wild guess, Land Rovers often have flakey electrics. 

Maybe read our Why won't my car's stop-start system work? feature for further understanding. We get a lot of questions like this.

Expert answer

Hi Robert.

Stop-start systems have a mind of their own — literally. They’re designed to only stop the engine when demand for electrical supply within the car falls low enough that it’s safe to do so. So if you’re running the air conditioning, for instance, or have the heat turned up, or if the engine is still in its warm-up phase, then it will either not shut the engine off at all, or will only shut it off briefly. Driving style also plays into it, as does where and when you’re driving. It also depends on the battery condition, so if you’re concerned about the short stop-start times, it’s worth having the health and charge level of the battery checked.

Finally, as we get so many questions on this subject, we put together a quick feature on it for your interest: Why won't my car's stop-start system work?

Expert answer

Hi Abdul,

Stop-start systems can stop working for a variety of reasons, usually to do with battery condition or load. We get so many questions about them that we've put together this feature that you may find of interest:

Why won't my car's stop-start system work?

Expert answer

Hi Stewart,

A lot of cars develop this 'fault' and it's usually to do with battery condition or load. We get so many queries about it that we put together a feature explaining it all that you may find of interest:

Why won't my car's stop-start system work?

Expert answer

Hi Cathy,

Many cars develop similar problems, usually because of battery condition or load. Our feature on the subject, Why won't my car's stop-start system work? may help you further.

Expert answer

Hi Debbie,

It doesn't sound to us as if this is anything to do with the stop-start system, but actually an issue with the engine itself that needs looking at by a good mechanic. You've not told us which generation of EcoSport you have, nor which engine it has, but the 1.5-litre TDCi diesel has a known issue with the turbocharger wastegate valve that could cause engine running issues. It might be worth mentioning to the mechanic when you bring it to be checked.

Best of luck

Expert answer

Hi Kieran,

We would expect most stop-start issues to be sorted by a new battery, but the installer is correct: auto stop won't always work. In fact, we get so many queries about the subject that we wrote this feature you may find of interest: Why won't my car's stop-start system work?

Expert answer

Hi Kate,

There are loads of reasons for an engine's stop-start system to stop working (see our Why won't my car's stop-start system work? feature), but it rarely is linked with a dangerous issue. 

Saying that, there's no harm at all in bringing your car to a good mechanic to have it diagnosed to confirm that nothing major is amiss.

Best of luck with it

Expert answer

Hi Mirza,

That's a really unusual one and you're best getting the car along to a good garage to have it inspected. There's a known issue with the original Peugeot 5008 1.6 diesel where the earth connection to the starter fails causing all kinds of random engine and starting issues, so this could be related, but either way you'll need a mechanic to fix it.

Best of luck

Expert answer

Hi Clare,

Stop-start systems are a source of annoyance for a lot of people. We get so many queries about them that we wrote this feature you may want to read: Why won't my car's stop-start system work?

Saying all that, the point of a stop-start system is to reduce fuel consumption and emissions, so it's seriously pointless to go on a drive specifically to charge up the battery to make it work. It could be that your battery needs to be replaced completely.

Expert answer

Hi Dave,

There is no recommended way to deactivate the stop-start system permanently. If you turn it off using the button in the car, it will always come back on next time you start the car. 

Have you read our Why won't my car's stop-start system work? feature to try to get to the bottom of the issue?

Expert answer

Hi Razanne,

If this is the diesel version, it's possible that the issue has nothing to do with the stop-start system at all, as its engine is known to develop problems with the fuel injectors that could lead to poor running and stalling.

Otherwise, all we can suggest is that you read our Why won't my car's stop-start system work? feature to see if anything helps - and persevere with your mechanic to get to the bottom of the issue. An auto-electrician might be worth visiting, too.

Expert answer

Hi Bepin,

There are many reasons why a car's stop-start system will not work. And we get so many queries about it that we've put together this Why won't my car's stop-start system work? feature.

Give it a read and if you're still not convinced, then bring your car along to a good mechanic to have it diagnosed.

Expert answer

Hi Gloria,

Stop-start systems generally don't have any settings as such. They are on by default and will automatically turn the engine off when appropriate. The driver can manually switch the system off when the car is running.

So basically it's on or off. Leave the system on for (slightly) better fuel economy in slow traffic situations where you might be stopped for prolonged periods of time.

Expert answer

Hi Beth,

Stop-start systems from all car makers do indeed have a long list of situations in which they won't work. We get so many queries about it that we wrote a guide called Why won't my car's stop-start system work?

It's certainly preferable to have the stop-start system not working rather than the car cutting out when you don't want it to.

Expert answer

Hi John,

Lots of people find that their car's stop-start system stops working for no obvious reason, though it's disappointing that the garage fobbed you off rather than come up with a fix. 

We've had so many queries that we've put together a guide called Why won't my car's stop-start system work?

Have a read through that and see if it helps shine a light on the situation. Faulty temperature sensors and batteries in poor condition are very common causes.

Expert answer

Hi Roy, 

That's not something we've come across, I'm afraid. There can be many simple reasons for a stop-start system to not work (see our popular feature on that subject here), but usually they are temporary. I guess if your battery was replaced, there may be some additional reprogramming required, but that wouldn't be standard on all cars.

If someone has told you that this is necessary, make sure you get a second opinion from another garage, preferably an official Suzuki service outlet. And if Suzuki told you that, then ask for a little explanation.

We'd be interested in the answer if you want to pop a comment in below this at a later stage.

Expert answer

Hi Anne,

There are loads of different reasons why a stop-start system won't work as you might expect it to. Most of the time it's down to the condition of the battery or the drain on it, though it could be due to the ambient temperature, too. Here are a couple of items on the site to read through before you consider having the car looked at:

Why won't my car's stop-start system work?

Why does my stop-start not always work?

Expert answer

Hi Juliana,

We don't know of any common issue with the Insight, so it's probably a protection mechanism for the battery. We get a lot of similar queries, which prompted us to write the Why won't my car's stop-start system work? feature - well worth a read.

Expert answer

Hi Janie,

On the parking sensor issue, it just seems to be a bit of a quirk with the Audi Q7 that to get the front sensors on when moving forwards, you have to press the parking sensor switch, although they do, as you point out, come on automatically when you select reverse. We’re not sure why this is, but it might be worth a visit to your dealer to see if there’s some finicky bit of software code that can be re-set to activate them automatically at low speeds.

As for the stop-start system, if could be a few things. Obviously, there may be a fault, in which case get the car booked into your dealer for a check-up. Or it could be that you’re doing a lot of low-mileage, short runs, which aren’t allowing the engine and other systems to get fully up to temperature. Stop-start isn’t a simple on/off system — it’s controlled by the engine management and that won’t let stop-start activate if it thinks that the engine hasn’t warmed up enough (stopping and starting a cold engine can be damaging) or if it has detected that you have a lot of high-energy drain systems (air conditioning, demisters etc) running. Try and analyse your driving the next time you go out and see if any of this fits. If not, head for your dealer. 

Expert answer

Hi Silvester,

We have got so many questions from readers about non-functioning stop-start systems (from all makes and models) that we put together this guide to help you get to the bottom of it:

Why won't my car's stop-start system work?

Expert answer

Hi Tracy,

I'm afraid without knowing exactly which car you have, this is impossible to diagnose. You should bring the car to a good mechanic or auto-electrician.

There are many reasons for a stop-start system to not always work. Read this question and answer on that subject for instance.

Expert answer

Hi Anna,

There are plenty of reasons why a stop-start system won't work in certain circumstances. It's different for every car, but it's well worth reading this other reader question for a general overview, even if it doesn't specifically apply to your car. 

If none of that helps, then pop along to your Peugeot dealer, as the car is still under warranty.

Expert answer

Hi Emma,

I think a hybrid could well suit you, and with your M50-heavy driving (especially in stop-start traffic) it could prove ideal. The IS 300h is indeed a lovely car — beautifully built and good to drive, but you might find that the cabin and boot are on the small side for your family needs. It could be worth looking at the larger GS 300h (same engine, similar real-world economy) or maybe the NX 300h crossover. If you fancy something a bit cheaper, the Prius is always a good choice, as is Kia’s really rather good Niro hybrid.

Read our reviews for more:

Lexus IS reviews

Lexus GS reviews

Lexus NX reviews

Toyota Prius reviews

Kia Niro reviews

Expert answer

Hi Anne Marie,

Stop-start systems on cars will stop working for a variety of reasons, some of them outside your control, but if you think your SEAT still has a problem after looking through this list of possibilities, best bet is to get the car along to your nearest SEAT dealer to check it out:

- Ambient temperature too cold
- Ambient temperature too hot (unlikely in Ireland!)
- Battery in poor condition
- Driver's seat belt usually must be on
- Driver's door and bonnet usually must be closed
- Engine temperature is too low
- Climate control settings may force the engine to stay on

Hope that's of some help. This question by an Audi owner has proven very popular and is mostly applicable to your car too.

Expert answer

Hi Marc,

You've not told us which engine you have so we're going to assume a 2.0 TDI diesel. No matter which version of that engine it is of that age, the change interval is 210,000 kilometres. We'd suggest doing it more frequently if the car is used mostly in urban environments and stop-start traffic.

Expert answer

Hi Rory,

Assuming you really do mean the 1.5 TDCi diesel in the latest Focus (which was only launched in 2015), then Ford recommends every 180,000 kilometres or 10 years. We's suggest earlier if the car is used in town a lot in stop-start traffic. That applies to all 95hp and 120hp versions, as well as the 105hp ECOnetic model.

Expert answer

Hi Stephen,

You've not told us a lot about the car so we've made some assumptions. The earlier versions had a change interval of 120,000 kilometres and the later models were 150,000 kilometres, with the belt tensioner changed every second time in both cases.

As ever, if a car is used in a lot of stop-start, heavy traffic situations, we'd advise drivers to change their belts more frequently than the car makers suggest.

Expert answer

Hi Naseem,

If you’re driving the M50 a lot, it probably  depends what time of day… Post-10am or pre-4pm and you’d probably get up enough speed to be able to keep the DPF clear and so it wouldn’t be a problem, even with the relatively low mileage. If you’re stop-start driving and not getting into a proper heat cycle, then no, go for petrol instead. Ford has that brilliant little 1.0-litre EcoBoost turbo petrol engine.

Expert answer

Hi Gerry,

Of the two, I’d prefer the 1.3 diesel. Neither is an especially refined engine by modern standards, but the 1.7 is a terrible old thing – incredibly noisy, rattly and prone to stalling when driving in stop-start traffic. The 1.3, if you get it with the 90hp output, has decent performance, is very economical and doesn’t seem to give too much bother. Great that you’re doing your own servicing, but beware of what effect that may have on the resale value as most buyers prefer to see a healthy book of dealer service stamps.

Expert answer

Hi Max,

Well, the official combined fuel economy figure is 51.4mpg, but that sounds a bit optimistic to us. Doing short journeys shouldn’t be a major issue as it’s a petrol engine, but a bit of gentle driving should get you at least past the 40mpg mark, unless you’re stuck in stop-start traffic all the time. I wouldn’t bother using premium petrol, as you’re just wasting your money. The engine is designed to work on standard 95RON pump fuel, so just use that, but make sure you buy from a reputable supplier.

Expert answer

Hi Declan,

It’s a tough one. Generally I’d say for the moment, diesel is still best for that kind of mileage, especially day-to-day. A model with a good stop-start system should help keep the consumption down in heavy traffic (Mazda’s system on the 6 2.2 diesel is especially good) and those long motorway miles are just what diesel was designed for. A plugin hybrid is really for those doing short urban journeys most days, with only an occasional long trip, so I don’t think any would be really suitable for you. It would be worth looking at a new-shape Toyota Prius hybrid though – we managed to average 60mpg in one recently over the course of a week, including several long motorway runs, so it’s worth thinking about.

Expert answer

Hi John,

No, it’s not just another cost to the consumer. Stop-start systems are designed to prevent the car from running the engine unnecessarily at standstill when doing so would be at its most wasteful of fuel. After all, if you’re not moving then what is the point in having the engine on? Stop-start systems are specially designed with either a beefed-up alternator or an integrated starter/generator so that it can handle multiple stops and restarts in rapid succession, and it’s estimated that on an average car, stop-start can save as much as ten per cent of overall fuel consumption – not to be sniffed at, never mind the benefits to city-centre air quality.

Admittedly, the car makers have brought in stop-start to bring their cars' official CO₂ and fuel consumption figures down, and the benefits are only really felt if you are stopping and starting regularly. If you spend all your driving time on the motorway then you won't use the system at all.

Expert answer

Hi there,

Right, I'll be honest - we had to get on to Nissan Ireland for help with this, but it came through in spades.

Over and above the SV model, the SVE added Xenon headlights, Intelligent Key, illuminated passenger sunvisor, seven-speaker BOSE audio system, 17-inch alloys and rear parking sensors.

The engine has a timing chain, not a belt, so it doesn't need replacement,  but it does need to be inspected at regular intervals. Any Qashqai with a full service history should be fine on that score.

In terms of economy, the 1.6 petrol Qashqai got 44mpg overall while the 1.6 diesel got 55mpg, or 60mpg if it was fitted with the stop-start system.

Hope that all helps

Expert answer

Hi Barry,

It depends on whether it's the 90hp versions (with CO₂ emissions of 109g/km) or the 134hp stop-start version (CO₂ of 94g/km). It'll be either 15 or 16 per cent of the open market selling price, which is around the €16,000 mark - so around €2,400 to €2,500. 

Expert answer

Hi Elizabeth,

Ok, there's a simple answer and a not-so-simple answer. The simple answer is that the Fiesta is more economical. Going by the official figures, you'll get 78mpg on the combined cycle from the Fiesta (and that's for a model without the stop-start system fitted) and 57mpg from the Audi (that's the 125hp engine with a manual gearbox and 16-inch wheels).

Now, the not-so-simple bit. It depends on how and where you drive. If you drive mostly short journeys and mostly in town, then the diesel is not going to give its best, and that 78mpg figure is pure fiction anyway. I'd say in daily driving you'll probably get closer to 55mpg. The Audi, if driven with a bit of care and attention, should easily get 40mpg, even around town. So there's a gap, but it's not so big as you'd think.

The reverse is true if you're doing lots of long journeys at a steady motorway cruise. The Fiesta would come into its own and you''d probably squeeze 60mpg, maybe 65mpg from it. The Audi probably wouldn't get much above 45mpg, maybe a bit less, doing such journeys.

Expert answer

Hi Stephen,

I agree it can be a little annoying on an automatic car, as you can't decide when you do and don't want it to happen at any given moment. I'm sure you're aware that there is a button on the dashboard to disable it at any time, but it sounds like you'd rather disable it completely. Sadly, there's no legitimate way to do this. The car's official CO₂ emissions and fuel economy figures rely on this feature, so even if you find a fuse or relay to remove for the system there will at the very least be a warning light on in the dashboard - and it may even go into 'limp home' mode.

By way of explanation, the 'combined cycle' is a relatively low-speed and short duration (standardised) test cycle all the car makers adhere to for their CO₂ and fuel consumption figures. Stop-start makes a big difference for this as the car is idle for considerable amounts of time. In the real world, this tends to happen only in slow traffic or in town with lots of traffic lights. You would see a saving in those situations, but in reality it'll be small.

Sorry not to be of more assistance.

Expert answer

Hi George,

We'd need to reg. number to give you a definitive answer, as the official emissions rating for that car depends on a number of factors, including the factory-fitted wheel size, whether it has stop-start and whether it's the five- or seven-speed automatic gearbox. Possibilities include:

- 16-inch wheels, five-speed auto, no stop-start: 154g/km - Band C - €390 per year

- 16-inch wheels, seven-speed auto, stop-start: 129g/km - Band B1 - €270 per year

- 18/19-inch wheels, seven-speed auto, stop-start: 138g/km - Band B2 - €280 per year

Come back to us with either the registration or all those details and we'll give you the definitive answer.

Expert answer

Hi Anna,

There are several versions of that car, and there as a model year change in late 2009 so it depends which it is exactly. Here are a few examples, assuming you're not talking about the estate:

- 1.8 TDCi saloon with 100hp and five-speed manual gearbox: 149g/km CO₂ (Band C): €390

- 1.8 TDCi saloon with 125hp and stop-start (called 'Eco') and five-speed manual gearbox: 139g/km CO₂ (Band B2): €280

- 1.8 TDCi saloon with 125hp and five-speed manual gearbox: 154g/km CO₂ (Band C): €390

If you give us the registration number we can give you the exact price of tax.

Expert answer

Hi Tom,

If the stop-start system is not working ever then it's probably worth a trip to your Audi dealer to have it looked at, but bear in mind that there are plenty of conditions in which it will not operate and it may not be immediately obvious why. Here's Audi's official stance on it:

"The system is automatically activated when the ignition is switched on. If the driver doesn't want to use it, it can simply be switched off at the touch of a button.

"This is how it works: brake the car down to a standstill, shift into neutral and release the clutch. The system now switches off the engine and signals this via an indicator lamp. Depress the clutch before continuing the journey - the engine now starts automatically and the indicator lamp goes out again.

The start-stop function only works when...

• the driver's door and the bonnet are closed
• the driver is wearing a seat belt
• the vehicle has been driven at faster than 4km/h before stopping
• the vehicle is not pulling a trailer

In some cases the engine will not be switched off, for instance when...

• the engine temperature is still too low
• the difference between the interior temperature and the temperature selected via the air conditioning system is still too great
• the outside temperature is very high or very low
• the windscreen is being de-iced
• the optional parking aid or the optional park assist is activated
• the battery charge is too low
• the steering wheel is at a sharp angle or is being turned
• reverse gear is engaged
• the road is steep

The engine is started automatically by the system when...

• the vehicle rolls forward
• the windscreen is being de-iced
• there is a large difference between the interior temperature and the temperature selected via the air conditioning system
• the brake pedal has been depressed several times in succession
• the battery charge is too low

Expert answer

Hi Mary,

First off, no you're not crazy. The Clubman is a terrific little car and I actually own one myself. It's more practical than you might think and much more distinctive and different than the standard MINI Hatch. Secondly, on the alloys - blistering could mean that the paint finish is peeling off or that the metal underneath is starting to corrode. It may be that you could simply sand down the bubbles and have the wheels resprayed, or you may need to budget for some replacement wheels.

The only major mechanical issue is a recurrent gearbox problem that can lead to failure and replacement. As long as it shifts gear cleanly, you should be OK. Don't worry if the shift feels heavy, as they are supposed to feel like that. 

Other problems are persistent interior rattles, issues with the stop-start system and a windscreen that seems to be peculiarly prone to cracks and chips. No issues with the timing belt as long as the service history is up to date.

Expert answer

Hi Peter,

You're really comparing two quite different cars here. The Auris is a larger car than the Jazz, which is really more of a rival to the Ford Fiesta. Which means that the Auris is going to be more comfy and refined over a long distance, but if you're sticking mostly around town, go for the Jazz. There are no reports of the Auris' stop-start system causing any issues, but the Auris has been generating reports of problems with squeaky front brakes, slipping handbrakes and noisy gearboxes.

The Jazz, by contrast has generated no repeating fault reports and Hondas are usually incredibly reliable. Yes, parts can be a bit pricey for them (the Toyota would be cheaper to service and repair), but so few things go wrong that you probably won't need to spend much. Go for the Jazz so - it's sweeter to drive, has a cleverer interior and will probably prove more reliable.

Hope that helps

Expert answer

Hi Dawn,

Nissan quoted a combined consumption value of 5.4 litres/100km (52.3mpg) and we'd expect most drivers to get in excess of 40mpg (7.1 litres/100km) so long as all journeys aren't in stop-start traffic.

Hope that helps

Expert answer

Hi John,

Yes, but with one small caveat. The Prius has always been one of Toyota's best, and indeed best-built cars. It's essentially a flagship model, particularly for Toyota's eco-friendly ambitions. There have been a few recalls (for malfunctioning brake lights, airbags, steering and brake issues, as well as the infamous sticky-throttle-pedal one), but generally Prius are solidly reliable and there have thus far been no reports of fading or failing battery performance. We've heard one or two reports of rust breaking out, but they're probably most likely down to unattended panel damage exposing bare metal.

The caveat? It depends how and where you drive as to whether or not it's worth buying a Prius. Yes, you'll get cheap road tax, but to get even vaguely close to Toyota's quoted 65mpg fuel economy figures, you're going to have to drive with the reticence of a trappist monk. Get anywhere in the neighbourhood of enthusiastic driving and you're going to see the fuel economy plummet, ditto for undertaking any long motorway journeys. But, if you spend most of your time in town, where the Prius' electric motor and stop-start systems can best bring their armament to bear, then the economy should pick up, and you'll have one of the most comfortable, reliable and relaxing cars in which to hustle your way through city traffic.

Expert answer

Hi Ollie,

Generally speaking, you should be OK, as that 30-min run each day should be enough to keep a DPF hot enough to clean it out, but that’s if and only if that 30 mins is all run at high-ish speeds, say above 80km/h most of the time and in a lower gear. If you’re spending a lot of time in stop-start traffic, I think a petrol option might still be the better one. Mazda’s 2.0-litre petrol engine can be a bit thirsty, but the 1.4 TSI option in the Passat and A4 is a very frugal engine, and still has peppy performance.

Expert answer

Hi there,

It depends on your driving style, and on where you do most of your driving. If you’re in town all the time, and stuck in stop-start traffic, then it could be worth tracking down a Toyota Prius or a Honda Insight hybrid, bot of which should sip fuel in such circumstances. If you’re up on main roads and motorways all day long, then diesel is still a good idea. A VW Golf 1.6 TDI BlueMotion would be a solid bet for maximum economy then, although if you fancy something a little more stylish, a MINI Cooper D (with the 1.6 diesel engine) will crack 60mpg on a long run.

Expert answer

Hi Daniel,

You've not told us which of the Insignia diesels you're looking at, and whether you're buying new or used, but in general Opel's diesel options in the Insignia are a little on the loud side. However, they all give good performance and economy, and the latest come with stop-start.

Come back to us if you need more detail than that

Expert answer

Hi Teresa,

We spoke to Volkswagen and I'm afraid there's no permanent way to switch this off that it recommends. You'll just have to do it manually each time you start up if it bothers you.

From our perspective, this feature is becoming more and more common and we think it's a great idea. If all cars on the road used it think how much fuel could be saved in town. Likewise - and in contrast to what you've said - noise pollution would be reduced overall thanks to the lack of engine idling noise at traffic lights.

Don't worry about the starting motor wearing out either, as most cars with stop-start have heavier duty starters, along with systems to monitor their condition and prevent it being over used.

Expert answer

Hi Noel,

Two new models have been launched in the Skoda Yeti range and these make up part of a strong model line-up for 2011, which will include a new 4.9 per cent finance offering on Yeti models. Skoda, as part of the Volkswagen Group, will offer finance through its own bank.

The two new models in the Skoda Yeti range are a 1.6-litre TDI Greenline that has 105hp and replaces the 2.0-litre 100hp diesel. It has emissions of 119g/km, which means it sits in motor tax band A.

The car features stop-start technology, low-rolling resistance tyres and brake energy recuperation. Prices start at €23,165 for the Greenline Active, €24,125 for the Ambition model and €26,035 for the Experience.

Also on offer for the first time is the 4x4 version. It comes with a 2.0-litre diesel engine putting out 170hp and with emissions of 155g/km it sits in motor tax band C.

There are Ambition and Experience specifications available for this model and prices are €29,545 for the Ambition and €31,480 for the Experience.

Skoda sold 775,000 cars worldwide in 2010, but has ambitions to sell 1.5 million by 2015. It will launch several new models to the line-up between now and then.

A small A-segment car that will take on the Ford Ka and Toyota iQ will go on sale in 2013, followed by a replacement to the Skoda Octavia that same year. A new version of the Skoda Roomster comes in 2014 and that same year a new version of the Fabia will arrive.

The new Yeti models are now in dealerships. 

Hope that helps