P0121 — Throttle Position Sensor Performance Malfunction

Throttle Position Sensor Performance Malfunction. The engine computer noticed that the signal coming from the throttle pedal or valve position sensor does not match the actual airflow or engine load. In plain words, the computer is getting conflicting messages about how far you are pressing the gas pedal and how the engine is actually responding.

With caution: limp mode possible, have it checked soon

Worn or dirty throttle position sensor or electronic throttle body Loose, corroded, or damaged wiring connectors at the sensor Internal fault within the engine control computer

Have a technician inspect the wiring connectors and clean the throttle body area first, as carbon buildup often causes this. It is best to look into this soon to avoid unexpected hesitation or loss of smooth acceleration while driving.