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Hi Shayne,

Electrics, electrics, electrics. The W211 was full of electrical and electronic toys and all of them are suspect. Mercedes was going through an especially poor stage in its history at this point and the W211 suffered more than most models. Anything with a wire poking out of the back is a potential worry and the battery can run it self flat if the car is left standing even for just a few days.

The electronic brain that controls the brakes is also deeply troublesome often leaving the car in limp home mode. Check that the automatic gearbox picks up gears smoothly and that there are no flat spots in the engine's power delivery. Paint can often be an issue too - check for damage or flakes coming off.

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Hi Ragnar,

Several things can cause that, so you need to take the car to an auto-electrician to ascertain which. Possibilities:

1) The battery itself needs to be replaced, but don't do that until you're sure it's none of these other things.

2) The alternator isn't charging the battery properly. Check for loose leads and/or the alternator belt itself before paying an auto-electrician to check it.

3) Something may be staying on to drain the battery when you turn the car off. It could be a light in the boot or glovebox or the alarm or stereo or something else entirely. Will need a little investigation.

Best of luck with it - let us know how you get on.

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Hi Milan,

It sounds to us like a bad earth or, surprisingly common, an incorrect bulb. Try changing that first to see if it cures the issue.

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Hi Shirley,

Generally speaking, the Micra (especially the 2002-onward model, which is probably the best Micra there's ever been) is something of a gold standard for reliability, but there are a couple of small recurring items to look for. The immobiliser system can sometimes go a bit haywire and drain the battery, the seat adjustor cables can snag, the boot and door seals occasionally leak and if you hear a knocking noise from the steering on full lock it means the front suspension is out of alignment.

Other than that, cracking little car and it should give years of solid service.

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Hi Chris,

The thing to bear in mind here is that the engine rarely has to directly power the wheels; most of the time it operates (at set optimum speeds) to turn the generator and charge the battery pack. Other than that, when it does power the front wheels it's at specific speeds in particular conditions, for which we assume it has been calibrated. The addition of a CVT may well enhance the situation, but it would add another chunk of weight to an already heavy vehicle.

Electric motors don't need a continuously varying gear ratio to operate efficiently.

You can read our drive of the Mitsubishi Outlander PHEV here

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Hi Deck,

There seems to be a bit of split in S-Max ownership between those who have solidly reliable cars and those who keep suffering annoying niggles. Electrical faults are surprisingly common, and can range from knackered windscreen wipers to a fault that drains the battery over the course of a couple of days. Other have complained of some loose-fitting interior trim, especially around the doors. Keep an eye out too for clonking noises coming from the steering, stiff brake pedals or the diesel engine cutting out mysteriously.

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Hi Ernest,

Toyota previously answered a question for a reader regarding battery life as follows:

"It depends on the vehicle and how it's driven, but as long as the vehicle is in regular use and is serviced then the battery life is expected to be over 10 years. High mileage batteries can last longer than vehicles that do low mileage or are not in frequent use. Like any other battery type if it is in regular use and kept conditioned this will extend the battery life."

We can confirm that there are no known health risks from the batteries. The cost of replacing the batteries varies from model to model.

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Hi Catherine,

Not necessarily. The 1.6-litre diesel used in the C-Max is an engine used in a huge variety of cars, from the C-Max to the Focus to the Mondeo to various Citroens, Peugeots, Volvos and even the occasional MINI. This means that, by and large, it's a decent engine with good reliability prospects and millions of miles of use in a massive number of cars to reveal any bugs.

That said, there are a couple of issues to watch for and mostly it's to do with the turbocharger, which can occasionally be a weak point. Usually it's down to a failure of the exhaust gas recirculation (EGR) valve, and it can be pretty easily fixed. Watch the parts prices and shop around for quotes if anything does go wrong. Alternators can give trouble too, so be suspicious of any engine or battery warning lights.

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Hi Louis,

We thought it best to send this one to Toyota's tech people as they have more experience than most. Here's what they told us:

"It depends on the vehicle and how it's driven, but as long as the vehicle is in regular use and is serviced then the battery life is expected to be over 10 years. High mileage batteries can last longer than vehicles that do low mileage or are not in frequent use. Like any other battery type if it is in regular use and kept conditioned this will extend the battery life."

Hope that's of interest

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Hi Bernadette,

I'd say between €7,000 and €8,000 on a trade-in, depending on what you're trading it in against.