Ford P2121 OBD-II Trouble Code Definition: P2121 Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance P2121 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P2121 Throttle/Pedal Position Sensor/Switch “D” Circuit Range/Performance Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. […]