The P0303 diagnostic trouble code on your 2024 Mitsubishi Eclipse Cross indicates the powertrain control module has detected consistent misfires in cylinder 3. The 2024 model continues with the refined 1.5L turbocharged engine.
2024 Eclipse Cross Powertrain
The 2024 Eclipse Cross uses the 4B40 1.5L turbocharged four-cylinder producing 152 horsepower. Cylinder 3 is third from the front on this inline-4. The direct-injected turbo requires specific maintenance.
Typical Causes
- Ignition Coil Problems: Turbo boost stresses ignition
- Spark Plug Condition: Must match turbo specifications
- Boost System Integrity: Leaks cause lean misfires
- Fuel Injector Issues: Direct injection deposits
- Carbon Deposits: GDI valve accumulation
Diagnostic Process
Use Mitsubishi diagnostic equipment for detailed access. Monitor boost and misfire data. Test ignition components systematically. Check for boost leaks.
Repair Recommendations
Replace faulty ignition coils with OEM parts. Install properly specified spark plugs. Repair boost leaks. Dealer service ensures warranty coverage.