Is It Safe to Drive With a P0120 Code?
Common Symptoms of a P0120 Fault
EML on
Hesitation or jerking under acceleration
Erratic idle
Possible limp mode
Reduced throttle response
Possible Causes of P0120
A P0120 code can be triggered by faults in several different vehicle systems. Identifying the specific root cause requires proper diagnostic equipment and live data analysis — not just reading the code itself.
TPS Wiring / Connector Fault
Damaged wiring or connector to the throttle position sensor.
TPS Sensor Failure
The sensor itself has failed or is out of range.
Throttle Body Issue
A fault within the throttle body assembly affecting the sensor.
ECU Signal Fault
The TPS signal is not being read correctly.
Why we don't list the exact part: A P0120 code tells you what's happening but not why. Replacing parts based on the code alone without proper diagnosis is the most common way drivers waste money. A proper diagnosis identifies the exact cause first.
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P0120 and Your MOT
A stored P0120 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test, which is an automatic failure under current MOT testing standards. Even if the light clears temporarily, the code remains in the ECU memory and can be read by the tester's equipment.
Get the fault properly diagnosed and repaired first — then have the code cleared and confirm the light doesn't return before booking your test.