Question about 2006 Audi A4

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My check engine light is on for my 2006 audi a4 amd autozone gave me a code of PO171. what is that code mean?

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Your MAF may be dirty and needs to be cleaned or replaced. You may have a vacuum leak.

In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure

Posted on Oct 06, 2009

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