Is It Safe to Drive With a P0340 Code?
Common Symptoms of a P0340 Fault
Engine may not start or is difficult to start
Stalling while driving
Rough running
EML on
Loss of power
Possible Causes of P0340
A P0340 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.
Camshaft Sensor Wiring Fault
Wiring or connector to the camshaft sensor is damaged.
Camshaft Sensor Failure
The sensor itself has failed.
Timing Component Issue
A fault in the variable valve timing system affecting sensor readings.
Oil Pressure / VVTi Fault
Low oil pressure or VVTi solenoid fault affecting cam position signal.
Why we don't list the exact part: A P0340 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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P0340 and Your MOT
A stored P0340 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.