If I replace my Audi A4's coolant sensor myself, how do I then reset the engine warning light?

I have an Audi S4 (the 2004 B6 version). The cause of the engine warning light coming on has been diagnosed by my local Audi dealership as a failure of the coolant sensor. They have asked for £310 to effect...

Why has my son's Ford Focus showed erroneous fault codes when diagnostically checked?

The engine warning light on my sons' 2002 Ford Focus 1.6 LX Estate illuminated about four months ago. He had it checked by a main dealer and was told the code indicated the Catalytic Convertor was defective....

My Mazda 323 will not run - what's wrong with it?

This afternoon my X-reg 1.4-litre Mazda 323 died. The engine starts but will not run, it's as if the ignition is being switched off. I'm guessing there is a very special piece of technology that keeps...

Why won't my Nissan Primera start?

When trying to start my Nissan Primera P12 it won't rev, it just splutters and then cuts out after a while. When turning it over it will start but won't rev, and when I drive off it just splutters and...

I've got a major electrical problem with my 2003 Peugeot 206 - can you help?

My 2003 Peugeot 206 2.0-litre HDI has stopped working. 'Eco Mode, Immobiliser Fault' has come up on my dash, my side lights are on and it turns over but won't start. There's no power to the wipers, indicators...

My 2003 BMW E46 318ci has come up with five Vanos fault codes - please help.

After having a misfire problem on my 2003 BMW 318ci E46, which turned out to be a crack in the coil pack rubber, I fitted new coil packs with new plugs, which sorted the misfire. Now I'm still getting...

Why won't my Volvo V40 start?

I have recently bought a Volvo V40 on a 52 plate. It's a 1.9d, an excellent car and I am very happy. However earlier today I was sat at some lights. When I went to pull away the vehicle cut out. I attempted...

Why is my Audi A4 hesitating under acceleration?

I have an Audi A4 TDI. When I put the boot down in second or third gear between 1000 and 2000 revs, the engine splutters as the turbo is working. It's like a dirty fuel filter but I know it's not, as it...

My Audi A3 is losing power and misfiring - what's wrong with it?

I've got an Audi A3 TDI 2-litre. It suddenly started misfiring and jerking while I was on the motorway. Now its got worse and is losing a lot of power. It sounds like a tractor. I have to rev it very high...

Who's responsible for repairing a fault in my Peugeot 407 HDi?

I bought a Peugeot 407 HDi from a trader. The third day after buying the car it started to misfire and lose power, and then after a few miles would clear itself. I took it back to the trader who took it...