I have a 2003 A4, the EPC light has been going on and off for a the last month or so. Usually when I restart the car maybe 1/2 to hour or so after having used it. The engine will crank for 30 secs and will not start. After a few trys it starts again. Should I address the problem ASAP before it gets worse, or can this wait till I see what happens next?
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I would check the fuel relay on this. They always go bad and the symptom is that as you are driving the car cuts out and will not start. Leaves you having to coast to a stop. Problem will only get worse to a point where it will not start again until replaced.
I am having the same problem on my Audi A4 2004 FSI, lose power whilst driving at speed with the EPC light coming on. Looks like a design fault of some kind with Audi petrol engins, have read a few forums about this but no clear straight answer. Check the link below:
I am not entirely familliar with this particular model, although in some similar models that I have worked on The epc (on deisel models) usualy indicates a problem with the particle filter.
This means that if your car has a particle filter and it has not reached a temperature that it can clean itself for a few months, it may become clogged and cause a restriction for the engine.
If you take your car to an audi dealer the mechanic will be able to do a quick test to confirm and he may then be able to overide the cleaning process and clean the filter. I would advise that this is done asap as dammage may be caused from very high exhaust temperatures.
your crankshaft positon sensor is defective. Replace it and the epc will never come back and no more dying out. this happened to me several times and it would just come and go. i replaced it and now the car starts right away and the epc light hasnt returned since
go to autozone the brake light switch is maybe $10 and easy to install yourself looks like a plug and is usually located under the brake pedal look brake light switch up on google and should find install instructions thats what i did and saved $100+