P0307: Cylinder 7 Misfire Detected
Do not keep driving
A flashing light means stop as soon as it is safe. Otherwise limit driving until diagnosed.
What this code means
Combustion is failing in cylinder 7, which means an eight-cylinder engine or larger. On V8s the odd-numbered cylinders normally sit on one bank, so a cluster of odd-numbered misfire codes points at something that bank shares — a camshaft sensor, a bank-specific fuel rail problem, or an intake leak on that side.
Likely causes
Start here
- Faulty ignition coil · easy
- Worn or fouled spark plugs · easy
- Clogged fuel injectors · moderate
Less common
- Damaged spark plug wire or boot · easy
- Vacuum leak in intake manifold or hoses · moderate
Rare
- Low engine compression · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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