Code PO121 typically indicates an issue with the throttle position sensor (TPS) in a vehicle. This sensor monitors the position of the throttle plate and sends that information to the engine control unit (ECU) to regulate engine performance. A PO121 code may suggest that the TPS is malfunctioning or sending incorrect voltage signals, which can lead to poor engine performance, reduced fuel efficiency, or stalling. It's important to diagnose and address this issue promptly to ensure proper vehicle operation.
code po121 means Throttle Position Sensor/Switch A Circuit Range/Performance Problem . it is usually indicative of a faulty throttle position sensor or faulty wiring harness in the engine bay.
Trouble code PO121 means:Throttle position circuit out of range or performance problem
P0121 - Throttle Pedal Sensor Switch "A" Circuit Range/Performance. Most common fix is to replace the Throttle position sensor.
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