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How do you diagnose reason for check engine light coming on intermittently?

(2005 Audi A4)
in Anacortes, WA on May 16, 2014
diagnostic code is P0722. Comes on and goes off periodically. How much does it cost to fix?
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Popular Answer
of G. T. Service Center on May 16, 2014
need more information, engine size, submodel build, etc. May be need to go to someplace like AAMCO for a free diagnosis and estimate.
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