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. 

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Hi Bernadette,

Sounds to us like the Qashqai is not a good one and it is likely to keep costing you money. We'd advise you trade it in for another car.

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Hi Barry,

Well, much though we love the new Camry, it’s actually quite small in the boot department — just 445 litres — so that probably counts it out here. The CR-V Hybrid is also a little short on boot space (just 497 litres). The incoming new Toyota RAV4 should have a decent boot, but if it’s boot space you need (and seat comfort too) then the Skoda Superb is hard to beat. Plus it looks smart, it’s nice to drive and well made. A brilliant package, really.

Relevant review links below:

Toyota Camry review

Skoda Superb reviews

Honda CR-V reviews

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Hi Pádraig,

It kind of depends on what car you’re driving, and how well serviced and maintained it is. The general rule of thumb is that steady, constant speed is the best for economy, but the slower the better. If you want the ultimate in economy set the cruise control for 80-90km/h but be prepared to live on the inside lane with the trucks if you’re doing that. That said, most cars run pretty efficiently at 110-120km/h, so as long as you accelerate gently, and don’t keep braking hard then speeding up, you should do fine. 

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Hi Anthony,

That’s a big question, and it really comes down to how you drive your car and, just as importantly, where you drive it. If you’re someone who drives long-haul on motorways week-in, week-out, then diesel power is still the best option for you, as for longer journeys there’s nothing more frugal. Some hybrids are getting closer to diesel economy on longer runs, but they’re not quite at parity yet. If you’re mostly doing short hops, or driving around town most of the time, then either petrol or hybrid power is the right way to go. Those are generalisations though — a lot will depend on your specific needs and tastes, and what sort of car you want. 

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Hi Ann,

The XC40 is a really likeable car, but you’ll probably find that it’s neither as refined, nor quite as comfortable to drive as the S60 (the ride quality just isn’t as good). It’s also less roomy in the boot. The Mitsubishi Outlander PHEV is a very clever vehicle, but to make the most of it, you need to have a driveway and a charging point, and be covering most of your mileage around town. The battery pack, on a full charge, should get you around 35km of electric-only driving, but if you head out on the motorway a lot, you’ll run the battery down very quickly and then fuel consumption will hover at around the 30mpg mark.

Read our reviews below:

Volvo XC40 reviews

Mitsubishi Outlander reviews

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Hi Declan,

With that high mileage, I'd suggest that you're still better off sticking with diesel, as you'll get far better fuel economy and, as you'll be changing your car frequently, the mileage is going to have a bigger effect on resale values that what powers it. That balance might change in a few years time, but today, in 2018, diesel definitely makes most sense for you. The 520d is an excellent car. As is the 530e, I might add, but the diesel still has the edge for long-distance driving, as you need to plug the 530e in regularly to get the best economy from it.

Read our BMW 5 Series reviews here

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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.

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Hi Michael,

Renault currently doesn’t have a scrappage offer available, but other brands — including Hyundai, Skoda, Peugeot, Opel and more — do and,  depending on which vehicle you’re looking at buying, you can get as much as €4,500 off.

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Hi Martin,

I'm afraid that's a tricky one to assess from afar. Usually, any beeping is accompanied by a warning light of some description, so keep an eye out for that. If you can't work out what it is then I suggest you bring the car to a Dacia dealer to look at.