P0301 Ford F-150
Cylinder 1 Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0301?
Misfire detected in cylinder 1. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Ford F-150 triggers code P0301 (cylinder 1 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Ford F-150.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford F-150.
Common Causes on Ford F-150
- Ignition coil failure on cylinder 1 (very common on 3.5L EcoBoost and 5.0L Coyote)
- Spark plug broken during removal on 3.5L EcoBoost (stuck plug issue)
- Fuel injector failure on cylinder 1 GDI injector
- Intake valve carbon buildup on EcoBoost direct injection engines
- Low compression from valve seat issue on 5.0L Coyote
Symptoms
- Rough idle with noticeable engine vibration
- Engine shaking or vibration especially at idle
- Loss of power during acceleration
- Check engine light flashing (indicating catalytic converter damage risk)
- Poor fuel economy from unburned fuel
- Unburned fuel smell from exhaust
Notes for Ford F-150
Ford 3.5L EcoBoost spark plugs can break during removal; follow TSB procedure with penetrating oil.