P0121Severity: Medium
P0121 – Throttle Position Sensor A Range/Performance
The TPS reads outside the expected range.
What it means
The throttle position sensor signal doesn't match what's expected for the engine state. A dirty throttle body or worn sensor can be the cause.
Symptoms
- Erratic throttle response
- Rough idle
- Loss of power
- Check-engine light
Common causes
- Dirty throttle body
- Worn TPS sensor
- Wiring/connector issue
- Vacuum leak
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Frequently asked questions
What does trouble code P0121 mean?
P0121 – Throttle Position Sensor A Range/Performance. The throttle position sensor signal doesn't match what's expected for the engine state. A dirty throttle body or worn sensor can be the cause.
Can I drive with a P0121 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.