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Home >> Subaru >> 2013 >> Outback Base, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0172 System Too Rich (Bank 1) >> Outline Of Diagnosis >> Diagnostic method
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Diagnostic method

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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