Error code

OBD2 P0307

OBD2P0307
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Cylinder 7 Misfire Detected.

Severity

moderateCan be driven, but performance will suffer and it may cause additional engine damage if not addressed.

Summary

P0307 indicates that cylinder 7 is misfiring, which means it's not igniting properly during combustion. This issue can be detected by the crankshaft position sensor and camshaft position sensor.

Symptoms

  • Vibrations at idle
  • Decreased engine performance
  • Reduced fuel economy

Common Causes

  • Faulty cylinder #7 spark plug
  • Faulty cylinder #7 coil
  • Faulty cylinder #7 wiring
  • Faulty cylinder #7 fuel injector

Diagnosis

  1. Check for a technical service bulletin related to the issue.
  2. Swap ignition components between cylinder #7 and another cylinder to identify faulty parts.
  3. Inspect compression issues such as exhaust valve or head gasket leaks, especially if there are signs of overheating or coolant loss.

Fixes

  • Replace faulty spark plug, coil, wiring, or fuel injector in cylinder #7

FAQ

What should I do if my car has a P0307 code?

It's important to diagnose the specific cause of the misfire by checking components like spark plugs, coils, wiring, and fuel injectors in cylinder #7. If symptoms persist after swapping parts with another cylinder, further inspection for compression issues may be necessary.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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