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Home >> Subaru >> 2016 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0171 System Too Lean 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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