Question about 2001 Audi A4

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Check engine light and power loss

I have a 2001 Audi A4 1.8T that the check engine light recently came on and I noticed a loss in power. The car runs and idles fine just the loss in power. I do have a performance chip on the car and when I had that installed I noticed a hissing noise during acceleration which I assumed was the diverter valve releasing pressure. I dont hear that now. Could the diverter valve be the issue?

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Air flow meter sounds like your problem.

Posted on May 27, 2009

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Posted on Jan 02, 2017

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