OBD
P0307
Cylinder 7 Misfire Detected
What it means
P0307 means Cylinder 7 Misfire Detected.
Check these first
- Faulty spark plug or ignition coil on cylinder 7
- Clogged or leaking injector on cylinder 7
- Vacuum leak at the cylinder 7 intake runner
- Low compression in cylinder 7
- Engine mechanical damage
What to do next
- Confirm cylinder 7 misfire counts with an OBD-II scanner
- Swap the ignition coil and spark plug to check if the fault follows
- Test the fuel injector on cylinder 7
- Compression test cylinder 7
- Inspect the intake for leaks at that runner
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.