Audi A4 P0171
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P0171 error 2003 1.8t help! vacuum leak I think - AudiWorld Forums
Audi A4 2.0T P0171 System Too Lean P2187 P2279
Audi A4 2.0t fsi VW B5 p0171 p2187 FUEL SYSTEM LEAN - YouTube
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A4 B6 - P0171 and Throttle Flutter - AudiForums.com
New to the Audi World/ P0171 Code driving me nuts - AudiWorld Forums
Audi B6 A4 Check Engine Light P0171 & P0174 Solution FIX (2001-2006
Error code PO171 running lean, leak and part question with engine video
Audi DIY: Code P0171 System Too Lean (Bank 1)