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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Diagnostic Methods (Except Diesel & Hybrid) >> Adaptive Fuel DTC Diagnostic Techniques >> P0172/P0175 System Too Rich Diagnostic Aids

P0172/P0175 System Too Rich Diagnostic Aids

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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