This is a discussion on Check engine light???? within the Computer and Fuel Systems forum, part of the Audi Reviews category; I just finished changing my airfilter to a K&N fitted and took my B5 A4 up the road. Then the ...
I just finished changing my airfilter to a K&N fitted and took my B5 A4 up the road. Then the check engine light goes on. The car runs fine but can anyone help me on how to remove the check engine?
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