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Home >> Subaru >> 2021 >> Crosstrek Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Engine Control System (2.0L (Except For HEV)) (Diagnostics) (4 Of 4)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P2196: A/F/O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 >> General Description >> Outline Of Diagnosis

Outline Of Diagnosis

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Detect that λvalue remains rich.

Judge as NG when lambda value is determined as abnormal in accordance with driving conditions such as intake air amount, rear oxygen element impedance, main feedback control, and with front oxygen (A/F) sensor λvalue.

λvalue = Actual air fuel

ratio/Theoretical air fuel ratio

λ> 1: Lean

λ< 1: Rich