P0121 – Throttle Position Sensor A Circuit Range/Performance
- System
- Engine
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- —
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Description
- Throttle Position Sensor A Circuit Range/Performance
- Detection / symptoms
- 1.Check engine light on
- Possible causes
- 1.TPS has intermittent open or short internally 2.Harness is rubbing and causing an open or short in the wiring 3.Bad connection at the TPS 4.Bad PCM (less likely) 5.Water or corrosion in connector or sensor
- What to check
- 1.Read the code and freeze-frame data with an OBD-II scanner 2.Check the connector and wiring of the part named in the code 3.Test the part with scanner live data or a multimeter, using the values in the repair manual 4.Fix the cause, clear the code and test-drive
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights