The P0304 diagnostic trouble code on your 2022 Honda Accord indicates the engine control module has detected consistent misfires in cylinder 4. The 10th generation Accord offers turbocharged four-cylinder options.
2022 Accord Engine Options
The 2022 Accord offers the 1.5L turbocharged four-cylinder (192 hp) or 2.0L turbocharged four-cylinder (252 hp). On both inline-4 configurations, cylinder 4 is the rearmost cylinder, closest to the firewall.
Common Causes
- Ignition Coil Failure: Cylinder 4's position experiences heat soak
- Spark Plug Issues: Turbocharged engines require specific plugs
- Fuel Injector Problems: Direct injection deposits
- Carbon Buildup: GDI technology leads to valve deposits
- Boost System Leaks: Turbo models sensitive to intake leaks
Diagnostic Approach
Use a Honda-compatible scanner for detailed diagnostics. Monitor misfire counts and boost data. Test ignition components through swap testing. Check for carbon buildup symptoms.
Repair Solutions
Replace failed ignition coils with Honda OEM or quality aftermarket parts. Install properly specified spark plugs. Address carbon buildup through professional cleaning. Repair boost system leaks.