Is It Safe to Drive With a P0354 Code?
Common Symptoms of a P0354 Fault
Misfire on affected cylinder(s)
Rough idle
EML on
Loss of power
Possible Causes of P0354
A P0354 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.
Coil D Wiring Fault
Wiring or connector to coil D is damaged.
Coil D Failure
Coil D has failed.
Spark Plug Failure
Failed spark plug overloading coil D.
ECU Driver Fault
ECU driver circuit for coil D has failed.
Why we don't list the exact part: A P0354 code tells you what's happening but not why. Replacing parts without diagnosis is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0354 and Your MOT
A stored P0354 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure. Get the fault diagnosed and repaired, then have the code cleared before booking your test.