A P0303 diagnostic code on your 2022 Mitsubishi Eclipse Cross indicates the engine control module has detected repeated misfires in cylinder 3. The compact crossover uses a 1.5L turbocharged four-cylinder engine.
1.5L Turbo Engine Layout
The 2022 Eclipse Cross uses the 4B40 1.5L turbocharged four-cylinder producing 152 horsepower. Cylinder 3 is the third from the front on this inline-4 configuration. The turbo system adds complexity to diagnosis.
Common Causes
- Ignition Coil Failure: Turbo boost stresses ignition systems
- Spark Plug Issues: Turbocharged engines require specific plugs
- Boost System Leaks: Sensitive to intake and charge pipe leaks
- Fuel Injector Problems: Direct injection deposits
- Carbon Buildup: GDI technology leads to valve deposits
Diagnostic Approach
Use a Mitsubishi-compatible scanner for turbo-specific diagnostics. Monitor boost pressure and misfire counts. Test ignition components through swap testing. Check for boost leaks.
Repair Solutions
Replace failed ignition coils with OEM components. Install Mitsubishi-specified spark plugs for turbo applications. Repair boost system leaks. Address carbon buildup through professional cleaning.