Common Checks
- Inspect cylinder 7 ignition parts and injector connector.
- Swap-test the coil or plug and monitor whether the misfire moves.
- Check compression if ignition and injector checks pass.
Diagnostic trouble code
P0307 Cylinder 7 Misfire Detected
The PCM detects a misfire on cylinder 7.
Misfire CodesCommon Repairs
- Replace the failed ignition, boot, wire, plug, or injector component.
- Repair wiring or mechanical faults when the misfire stays on cylinder 7.
Mustang Notes
- Cylinder 7 does not exist on V6 and EcoBoost Mustangs, so this code only applies when the engine has that cylinder.
Model-Year Applicability
Listed for 1996 and newer traditional gasoline Mustang pages in this first-pass catalog. Engine, calibration, and Ford-specific codes may narrow that range as more service data is added.