Is It Safe to Drive With a P0325 Code?
Common Symptoms of a P0325 Fault
EML on
Possible slight power reduction as ECU uses conservative timing
Pinging or rattling noise under load in some cases
No obvious symptoms in mild cases
Possible Causes of P0325
A P0325 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.
Knock Sensor Wiring Fault
Wiring or shielded cable to the knock sensor is damaged.
Knock Sensor Failure
The sensor itself has failed.
Connector Fault
Corrosion or damage in the sensor connector.
ECU Input Circuit Fault
The ECU circuit reading the knock sensor has a fault.
Why we don't list the exact part: A P0325 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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P0325 and Your MOT
A stored P0325 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.