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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 >> Base Engine

Base Engine

Engine oil contaminated with fuel can contribute to a rich running engine.