TPS Range/Performance
The throttle position sensor reading is outside expected parameters.
Have this diagnosed before driving further
Informational only. Consult a qualified mechanic.
- Worn TPS
- Carbon buildup on throttle body
- Wiring issue
Clean throttle body and replace TPS if needed.
What does P0121 mean?
The P0121 OBD-II diagnostic trouble code (DTC) indicates: tps range/performance. This is a high-severity powertrain code that your vehicle's onboard diagnostics system triggers when the throttle position sensor reading is outside expected parameters. If your check engine light is on with this code, you should have the vehicle inspected immediately before driving further.
Use Your Service Book to log this diagnostic trouble code to your vehicle's service history, track repairs, and get maintenance reminders — all for free.
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