Is It Safe to Drive With a P2302 Code?
Common Symptoms of a P2302 Fault
Misfire on affected cylinder
Rough idle
EML on or flashing
Loss of power
Possible Causes of P2302
A P2302 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.
Ignition Coil Secondary Failure
The secondary winding of coil A has failed.
High Tension Lead Fault
HT lead from coil to spark plug is damaged or has high resistance.
Spark Plug Failure
Spark plug on affected cylinder has failed causing secondary overload.
Compression Issue
Low compression on affected cylinder causing secondary misfire.
Why we don't list the exact part: A P2302 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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P2302 and Your MOT
A stored P2302 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.