Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P2101 To U0423) (2.5L) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P2123 Throttle/Pedal Position Sensor/Switch "D" Circuit High >> Component Description