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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2281 (Engine Controls - Diagnostic Methods - (Hybrid)) >> Adaptive Fuel Diagnostic Trouble Code (DTCs) Diagnostic Techniques >> P0172 System Too Rich Diagnostic Aids

P0172 System Too Rich Diagnostic Aids

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the system is rich at certain conditions, then the LONGFT PID is negative value at that airflow, indicating that decreased fuel is needed.

System rich concerns are usually caused by fuel system concerns, although the MAF sensor, and base engine (for example, engine oil contaminated with fuel) should also be checked.

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