A P0304 diagnostic code on your 2024 Toyota 4Runner indicates the powertrain control module has detected repeated misfires in cylinder 4. The completely redesigned 6th generation 4Runner features new powertrains.
2024 4Runner Powertrains
The redesigned 2024 4Runner offers the 2.4L turbocharged four-cylinder (278 hp) or i-FORCE MAX hybrid. Cylinder 4 is the rearmost on these inline-4 configurations. The turbo system requires updated diagnostic approaches.
Common Causes
- Ignition Coil Failure: Turbo stresses ignition components
- Spark Plug Issues: Turbo-specific requirements
- Boost System Leaks: Turbo sensitive to intake leaks
- Fuel Injector Problems: Direct injection deposits
- Software Calibration: First-year redesign may have updates
Diagnostic Approach
Use Toyota diagnostics for the new platform. Monitor boost pressure and misfire data. Check for TSBs. Test ignition components systematically.
Repair Solutions
Replace faulty ignition coils with OEM components. Install properly specified spark plugs. Repair boost leaks. Check for ECM software updates. Dealer service ensures warranty coverage.