Is It Safe to Drive With a P0308 Code?
Common Symptoms of a P0308 Fault
Rough idle
EML on or flashing
Loss of power
Hesitation
Possible Causes of P0308
A P0308 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 System — Cylinder 8
Ignition component on cylinder 8.
Fuel Delivery — Cylinder 8
Fuel not reaching cylinder 8 reliably.
Compression Issue
Mechanical condition affecting cylinder 8.
Wiring Fault
Circuit fault serving cylinder 8.
Why we don't list the exact part: A P0308 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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P0308 and Your MOT
A stored P0308 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.