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Home >> Ford >> 2005 >> Focus ZX5 S, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Diagnostic Methods (Except Diesel & Hybrid) >> Adaptive Fuel Diagnostic Trouble Codes Diagnostic Techniques >> DTC P0172/P0175: System Too Rich Diagnostic Aids >> Notes

DTC P0172/P0175: System Too Rich Diagnostic Aids: Notes

NOTE: If the system is rich at certain conditions, then the LONGFT PID would be a negative value at that airflow, indicating that decreased fuel is needed.

System rich concerns will be 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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