Expert answer

Hi David,

There are no major reported problems with the Q7 e-tron, and Audis in general tend to have very high levels of both quality and reliability. That said, as it’s a plug-in hybrid, check and see how much running it has done on electric. If the previous owners were especially conscientious about plugging it in and running on the battery, that could mean that the engine hasn’t actually been run very much, and that can lead to niggling reliability issues down the line. Sounds odd, but it’s true — regular, gentle running is best for long-term engine life.

Other than that, make sure that all the electric and electronic systems are all working as they should, as these are complex vehicles and difficult and expensive to put right if they develop problems. 

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Hi Helen,

OK, first off there’s nothing to be concerned about. People who are temporarily resident in Ireland are allowed to bring their cars with them, and not have to re-register or fully import them for as long as 12 months. There are no forms to fill out, you just have to be able to show proof of address, purchase, tax, and insurance when and if you’re asked. Students who are studying in Ireland can keep cars with them for the duration of their studies, even if that exceeds 12 months, so there are clearly generally lenient rules when it comes to this. Given that your daughter is (a) intending to return to the UK when it is safe to do so and (b) effectively sheltering with you because of the pandemic, I wouldn’t be too concerned about having the car taken away nor anything like it.

Really, the only issue that would arise is if your daughter wanted to sell the car here, but if she’s going to keep it, I would say you’ve not much to worry about. 

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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 Joe,

There aren’t any specific battery issues to look for, and the good thing about a plug-in hybrid is that you can’t fast-charge them, so there’s less likelihood of wear and tear on the battery cells from repeated rapid charges. Obviously, batteries do degrade a little over time, but you shouldn’t see more than a few percentage points wiped off the performance. Make sure you go for a fully-charged test drive first though, and if the range seems abruptly short (allowing for weather, traffic etc) then the battery might have been physically damaged at some point.

Other plug-in hybrids worth considering would be a BMW 530e, although that probably won’t squeeze into your budget, or a Volkswagen Passat GTE, which provides performance almost as good as that of the 330e, but for a much lower cost overall and it's more spacious. Don’t forget that the battery eats considerably into the 330e’s boot space, and it was never a big car inside to begin with. The updated Passat GTE (2020) was available as an estate, too...

BMW 330e review

Volkswagen Passat GTE review

Volkswagen Passat GTE Estate review

BMW 530e review

Expert answer

Hi Tanya,

There should be a manual external boot release — on an 07 Jetta it’s a rubberised switch, up under the VW logo and above the number plate. If that’s not working then it could explain why the key fob release is being inconsistent. Either way, a visit to your Volkswagen dealer is probably in order. It may just be that the battery in the key needs replacing, but you may need a new key, or at worst a replacement boot release. 

Expert answer

Hi John,

One known issue in those hybrid Fits/Jazzes affects the relay for the air conditioning compressor clutch. It can lead to battery discharging, etc. Might be worth investigating that.

Expert answer

Hi Howard,

If I were you, I'd stick with diesel for now. Assuming that, with such high mileage, you won't have time to plug the car in to charge it up regularly, the 530e won't get near the 520d's average economy. Once the battery charge is used up, you're effectively driving a heavy petrol car. The fact you're VAT-registered and can claim back the VAT on the diesel is another reason to stick with it for now.

Yes, electrification is coming to all cars, but we don't believe it suits all motorists just yet. The beauty of you changing your car every 15 months is that you can react quite quickly to changes in taxation and new model launches.

Expert answer

Hi Philip,

You are correct on all of the above. The chances of there being a high enough concentration of hydrogen in the air (when the bonnet is open) to cause an explosion are slim, but it's still good practice to take the potential spark of connecting the negative cable away from the area. 

Incidentally, older batteries and those being charged up are more likely to emit hydrogen, though it's no harm to do the same with the 'donor' car. The key thing here of course is that there's no spark produced when you connect the leads to the first battery. 

Expert answer

Hi Jim,

If you're talking about a regular combustion-engined petrol or diesel car and their 12-volt battery, then yes, assuming the alternator is working properly, it will be driven by the engine and will charge up the battery so long as the electrical load from the battery is less than it can supply.

If you're referring to plug-in hybrids, and their high-voltage lithium-ion batteries, then it's not as simple as that and it differs per model and even depends on the driving mode. Most will, by default, use the battery to the fullest before starting up the engine and then may not charge the battery much except for kinetic energy recovered during braking. The idea is that you plug them in to charge up the battery regularly for maximum efficiency. However, most of them have a setting to override that and actively charge up the battery using the engine. It's usually activated by a button or option in the infotainment menu.

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.