Is It Safe to Drive With a P0720 Code?
Common Symptoms of a P0720 Fault
Harsh gear changes
Speedometer issues
EML and transmission warning light
Possible limp mode
Possible Causes of P0720
A P0720 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Output Speed Sensor Wiring Fault
Wiring or connector to the output speed sensor is damaged.
Output Speed Sensor Failure
The sensor itself has failed.
Reluctor Ring Issue
The ring the sensor reads is damaged or has debris on it.
Fluid Contamination
Metal particles in gearbox fluid coating the sensor.
Why we don't list the exact part: A P0720 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0720 and Your MOT
A stored P0720 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.