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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0013 To DTC P0315 >> DTC P0171 or P0172 >> DTC Descriptors

DTC Descriptors

DTC P0171: Fuel Trim System Lean
DTC P0172: Fuel Trim System Rich

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