Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (P2101 To U0423) (2.5L) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P2196 A/F/O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 >> Component Description