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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2287 (Engine Controls - Diagnostic Methods (Except Diesel & Hybrid)) >> Adaptive Fuel Diagnostic Trouble Code (DTC) Diagnostic Techniques >> Resetting Long Term Fuel Trims >> DTCs P0171/P0174 System Too Lean Diagnostic Aids

DTCs P0171/P0174 System Too Lean Diagnostic Aids

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NOTE: If the system is lean at certain conditions, then the LONGFT PID would be a positive value at those conditions, indicating that increased fuel is needed.

The ability to identify the type of lean condition causing the concern is crucial to a correct diagnosis.

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