Common Checks
- Inspect cylinder 5 ignition, injector, and wiring.
- Swap a coil or plug to another cylinder and watch whether the code follows.
- Check for vacuum or runner-specific intake leaks.
Diagnostic trouble code
P0305 Cylinder 5 Misfire Detected
The PCM detects a misfire on cylinder 5.
Misfire CodesCommon Repairs
- Replace the failed plug, coil, boot, wire, or injector found during testing.
- Repair wiring or engine mechanical faults if ignition and fuel are good.
Mustang Notes
- On V8 cars, bank-specific companion lean codes can help distinguish air/fuel causes from ignition faults.
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.