OBD codes / P0121
P0121
ModerateThrottle/Pedal Position Sensor A Range/Performance
Get it looked at soon to avoid further wear.
Likely causes
- dirty or worn throttle body
- faulty TPS
- wiring fault
Common fixes
- clean the throttle body
- replace the throttle position sensor/body if needed
Seeing P0121 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0121 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.