What does code P0121 mean?
The TPS A sensor reports values outside the expected range compared to actual throttle opening.
OBD-II Code
P0121 — Throttle Position Sensor or Switch A Circuit Range or Performance Problem
The TPS A sensor reports values outside the expected range compared to actual throttle opening.
Common symptoms
- Hesitation
- irregular acceleration
- dead spots during acceleration
Possible causes
- Worn TPS
- stuck throttle plate
- dirty throttle body
Initial recommendation
Clean throttle body, test TPS across full range, replace if values are inconsistent.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0121 with your vehicle's actual symptoms for more complete diagnostic guidance.
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