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As far as I know, only Diesels have EGR valves. I assume yours is petrol, so I doubt it has one. Probably why you cant find any info on it. I think there will be another reason for it. What age/ mileage is the car. How does it run when it is not cutting out. does it normally idle OK, have (I...

It does sound very low. My Audi A8 3.0TDI with Quatro and 6 speed auto does a lot better than that. Should be more like 38mpg for that car, but then it does depend on how you drive. Also, you will get worse fuel economy (10 - 15% less) in winter as the mix of diesel is different to what they...

Yes, they are easy to replace. Injector will probably cost £200-300 though

what age/ engine/ mileage is it?

That was my point originally. It is better to fix the actual fault. I have worked on many VAG (admitidly not your model golf) cars and the fault codes are not cleared when the battery is removed. You need to connect it to a computer to clear them. Maybe that model is an exception. Also, is your...

I am just curious, but how often do you do this procedure?

faulty coil pack is very common on these. easy DIY job to change it.

Could try warming it up a bit to see if that frees it (with hot water)

Get a volt meter, or borrow one. 13Volts or more across the battery when engine running, then it is charging. If it is less, suspect alternator. Also check water/ acid level in battery and top up (if it is an old style batery that can be topped up.

A lot of cars have a blead point in the engine bay, where the water pipes go through the firewall and inside to the heater.

look for an independant bosch diesel pump repairer. The dealer is selling you a new pump, but yours can probably be repaired for much less. http://www.kellysearch.co.uk/gb-company-82183472.html these guys saved me hundreds a couple of years ago.

Top up the radiator water, and if that doesnt help, change the thermostat as it sounds like it is stuck open.

Sell the car and buy one with it already fitted would be the cheapest/ easiest way. Otherwise find Merc forum to post in.

I Dont know these cars, but is the cable running very close to the exhaust pipe, or somewhere else where it gets very hot? Make sure you clip it into its propper route, and dont just leave it loose after replacing it.

No, you are unlikley to have damaged them. Do you have big open style alloys fitted? brakes get a lot more dirt chucked at them if you have alloys and do wear out quicker. Also, make sure you remember to put the handbrake off before you start driving. (you may also have a sticking hand brake...

As other things are happening as well, I would suggest it would be something common to them all causing the fault. i.e. ignition switch, or bad earth point.

Firstly tell us why you want to do this. i.e what is wrong with the car. And no, it will not get rid of fault codes. You actually have to fix the fault to do that.

a small stone stuck in pad can do this. Do some hard braking 70mph to 0 reasonably briskly (dont lock the brakes up or have an accident because someone is close behind) do it 2-3 times. should get rid of any grease/ dirt in them. Also worn or sticking calipers, incorrectly fitted pads...

how tight are you? It is only £3.95 at www.mycarcheck.com You dont need to pay £30-£40 like some web sites charge. Of corse they will only tell you if it has been in a recorded, insurance claim accident. There are plenty of accident dammaged cars (especially very expensive merc's, BMW's...

So I take it that there are no rules/ regulations then, just common sense when fitting them.