P0121
Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
Powertrain · Generic (all makes)System: Intake Air/Vacuum + Electrical/Circuits
Fix within days. Damage or fuel waste builds up.
Likely causes
- Worn throttle position sensor
- Dirty or failing electronic throttle body
What to check first
Clean the throttle body; on drive-by-wire cars the sensor is often part of the throttle body.
Typical repair cost
$100 – $600
Independent-shop parts and labor for the usual fix. Your price depends on the actual cause and the vehicle.
Next step
General information, not a diagnosis of your vehicle. Repair costs are typical shop ranges, not quotes.