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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (Diagnostics) (P0171 To P0685) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0172 System Too Rich Bank 1 >> Outline Of Diagnosis

Outline Of Diagnosis

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Detect fuel system malfunction by the amount of main feedback control.

Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio measured by sensor.

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