Check Engine Light With Code P0171 and/or P0174 on Buick Regal

The exhaust gas recirculation (EGR) tube which connects the EGR valve to the intake manifold may develop an engine vacuum leak, causing the Check Engine Light to illuminate with code P0171 and/or P0174 stored.

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Average mileage: 125,000 (100,000–150,000)
Exhaust & Emissions affected: 3.8L V6
8 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004
13 people reported this problem
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