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Hi Christy,

First simple thing to try is to disconnect the battery for a few hours. If you still have the issue then bring the car to a decent mechanic for a check. It's likely they'll have to plug it into a diagnostic machine to reset the ECU.

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Hi Karen,

You've not mentioned the engine size, but assuming it's either the 1.8- or 2.2-litre TDCi diesel then the timing belt should be changed every 125,000 miles (just over 200,000km) or every 10 years.

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Hi Dileep,

The battery is in the boot.

We asked Toyota about using the spare wheel area for an LPG tank, but it declined to comment, suggesting that to modify the Prius in that way would invalidate its warranty.

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Hi Stephen,

If it won't turn over at all it sounds like the battery is flat (it takes a lot more charge to turn the engine than to light up the dashboard) or the starting motor has stopped working. As you mentioned slow degradation I'd suspect the battery, and perhaps the alternator isn't working to full efficiency. Best bet is to get a good mechanic or auto electrician to sort it out.

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Hi Paul,

We’ve been on to Opel Ireland about this and they suggest that the best thing to do is to visit your local dealer who will be able to troubleshoot the problem for you.

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Hi Paul,

This is a difficult thing to assess from afar I'm afraid so you're going to have to get a good mechanic to look at it. Assuming the starting motor isn't turning, it could be an issue with the wiring (bad earth) or with the starter itself, or even an issue with the key being used - it must be correctly coded to the car.

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Hi Terry,

It's very difficult to assess such an issue from afar I'm afraid. Is the engine turning over (i.e. the starting motor is fine)? Is there fuel in the tank? Is the fuel pump in the tank working? Is there spark? Has a sensor failed and there's an electronic problem?

You'll have to bring the car to a mechanic I'm afraid. Best of luck with it.

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Hi Niall,

Probably around €8k retail or €6,500 - €7,000 as a trade-in.

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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.