Code
P0120
Throttle
Throttle position sensor / pedal circuit malfunction
The throttle position signal is missing or out of range.
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Most likely causes
- Faulty TPS
- Wiring or connector fault
- Carbon on throttle body
Symptoms you may notice
- Check engine light
- Poor throttle response
- Limp mode
Checks to run
- Read TPS live values
- Clean throttle body
- Test sensor voltage
Tools you may need
OBD-II scanner
Multimeter
Throttle cleaner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.