When your 2019 Ford Explorer displays the P0304 code, the engine control module has identified consistent misfires in cylinder 4. The final year of the 5th generation Explorer offers multiple engine options.
2019 Explorer Engine Options
The 2019 Explorer offers the 3.5L V6 (290 hp), 2.3L EcoBoost four-cylinder (280 hp), or 3.5L EcoBoost V6 (365 hp Sport). Cylinder 4 location varies by engine configuration.
Common Causes
- Ignition Coil Failure: Age-related degradation
- Spark Plug Wear: May be approaching service interval
- Fuel Injector Issues: Direct injection deposits on EcoBoost
- Carbon Buildup: Common on EcoBoost at this age
- Vacuum Leaks: Component deterioration
Diagnostic Approach
Use Ford diagnostics for detailed access. Identify your engine type. At this age, systematic testing is important. Test ignition components.
Repair Solutions
Replace aging ignition coils with Motorcraft parts. Install new spark plugs. Carbon cleaning beneficial on EcoBoost. Repair vacuum leaks.