P0121 Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
Throttle position sensor A reading does not match expected values.
Common causes
- Worn sensor track
- Dirty throttle body
- Intermittent connector
Symptoms
- Check engine light
- Hesitation
- Limp mode
What to check
- Clean the throttle body
- Sweep the sensor slowly and watch for dropouts
- Check connector
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0121, follow the service information for that make and model.
Related codes
- P0120 Throttle/Pedal Position Sensor/Switch "A" Circuit
- P0122 Throttle/Pedal Position Sensor/Switch "A" Circuit Low
- P0123 Throttle/Pedal Position Sensor/Switch "A" Circuit High
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