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    VW Golf 5 GTI , 2.0 TFSI P0171 error, question about brake vacuum check valve

    Hello! Question about car - 2007. VW Golf 5 GTI , 2.0 TFSI BWA engine Manual Have P0171 CEL system too lean on car. While looking for causes found out that pumping the brakes while car is running makes the short term fuel trim spike to +25%. Many people are saying that brake vacuum check valve...
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