The P0303 diagnostic trouble code on your 2022 Mitsubishi Outlander indicates the engine control module has detected consistent misfires in cylinder 3. The completely redesigned 2022 Outlander features a new 2.5L four-cylinder engine.
2.5L Four-Cylinder Engine Layout
The 2022 Outlander uses a 2.5L naturally aspirated four-cylinder producing 181 horsepower. Cylinder 3 is the third from the front on this inline-4 configuration. The plug-in hybrid (PHEV) uses a different powertrain.
Common Causes
- Ignition Coil Failure: Individual coil-on-plug units can fail
- Spark Plug Wear: Iridium plugs eventually need replacement
- Fuel Injector Problems: Port injection system issues
- Vacuum Leaks: Intake manifold or gasket failures
- Valve Clearance: Hydraulic lash adjuster issues
Diagnostic Approach
Use a Mitsubishi-compatible scanner for detailed diagnostics. Monitor misfire counts across all four cylinders. Test ignition components through swap testing. The port injection system is simpler than direct injection.
Repair Solutions
Replace failed ignition coils with OEM or quality aftermarket parts. Install Mitsubishi-specified spark plugs. Address fuel injector issues through cleaning or replacement. Repair vacuum leaks as needed.