Hi, new in the forum, got my 2000 b5 last year, a week ago, change the "test tube" and also add a cold air intake, now have the check engine icon, i'm worry if that will harm the motor, how can i fix the problem???? don't want to go back !!!!
thanks
Billy

you mean test pipe?

vag your car...only way to know why its on

but i'll put money on your 02 sensors fouling up

thanks, you think that the sensor is bad, could the test pipe damage the sensor???
billy

search the archives for more info... there is ALOT of info out there

finally found the foulers, something very strange occurs, put the foulers, pipe/two short foulers/sensor.
Put the old sensor and the cel was there...take the sensor our clean it with CRC fuel injectors & sensor cleaner and mount it back.
When I was driving to an Audi shop to clear the cel the light went off in the trip. Did I save the money ??? or do I have to check that???