When your 2022 Toyota Corolla displays the P0304 code, the powertrain control module has identified consistent misfires in cylinder 4. The 12th generation Corolla offers reliable four-cylinder options.
2022 Corolla Engine Options
The 2022 Corolla offers the 2.0L Dynamic Force (169 hp), 1.8L hybrid (121 hp combined), or 1.8L base (139 hp). Cylinder 4 is the rearmost on all inline-4 configurations.
Typical Causes
- Ignition Coil Problems: Coil-on-plug failures
- Spark Plug Condition: Toyota-specific requirements
- Fuel Injector Issues: Direct or port injection depending on model
- Vacuum Leaks: Intake system integrity
- Carbon Buildup: Some models more susceptible
Diagnostic Process
Use Toyota diagnostics for detailed access. Identify your engine type first. Monitor misfire counts. Test ignition components systematically.
Repair Recommendations
Replace faulty ignition coils with Denso parts. Install properly specified spark plugs. The 2.0L D-4S system is generally reliable.