Here is a picture of the passenger side of the engine bay in my 1999 VW Passat. This is where the air filter is. Anyways, I attached an OBD reader(a must have tool) to my car. The OBD reader said I was having a misfire on cylinders number 2 and 4 and the car was running terrible. I read on-line about how some people (especially 2002) were having problems with their coils.
Coils in general will wear out over time. This will cause a misfire condition. In engines like this with one coil per cylinder you can diagnose a coil by putting a timing light on each one to make sure it is lighting the light consistently. So I skipped the timing light test (because I do not own a tiiming light) and ordered up a couple ignition coils. I thought I had it all figured out.
Well the coils did not good. Back to the internet I go and if found somone who had the same error readings that was fixed with a new computer module. So, I bought a used computer module from the junkyard(hey they guaranteed it) and replaced it in no time. It was an easy fix and solved my problem.
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