The P0304 diagnostic trouble code on your 2024 Toyota RAV4 indicates the engine control module has detected consistent misfires in cylinder 4. The popular compact SUV offers multiple powertrain options.
2024 RAV4 Engine Options
The 2024 RAV4 offers the 2.5L Dynamic Force four-cylinder (203 hp), 2.5L hybrid (219 hp), or 2.5L Prime PHEV (302 hp combined). Cylinder 4 is the rearmost on all inline-4 configurations.
Common Causes
- Ignition Coil Failure: Individual coil-on-plug units can fail
- Spark Plug Issues: D-4S has specific plug requirements
- Fuel Injector Problems: D-4S dual injection system
- Hybrid System Interaction: Engine operation varies in hybrids
- Carbon Buildup: D-4S helps reduce but doesn't eliminate
Diagnostic Approach
Use Toyota Techstream for detailed diagnostics. Monitor misfire counts during various hybrid operating modes. D-4S dual injection helps prevent carbon issues. Test ignition components systematically.
Repair Solutions
Replace failed ignition coils with Denso OEM components. Install Toyota-specified spark plugs. D-4S system is generally reliable. Dealer service ensures warranty coverage.