A P0306 diagnostic code on your 2024 Lexus ES indicates a cylinder 6 misfire condition. The 2024 ES350 continues to use the proven 3.5L V6 engine (2GR-FKS) producing 302 horsepower, making this code valid for your vehicle.
The ES350's V6 Engine System
The 2024 ES350's V6 features Toyota/Lexus's D-4S dual injection system, combining port and direct fuel injection for excellent combustion efficiency. This sophisticated fuel system provides benefits but also adds diagnostic complexity when troubleshooting misfires.
Primary Causes of Cylinder 6 Misfire
- Ignition Coil Degradation: Coil-on-plug design can fail suddenly
- Spark Plug Issues: Worn electrodes, incorrect gap, or contamination
- Direct Injector Problems: Carbon deposits or mechanical failure
- Port Injector Issues: Clogging or electrical failure
- Intake Carbon Buildup: Valve deposits affecting cylinder sealing
- Mechanical Issues: Low compression from valve train or piston wear
Diagnostic Approach
Cylinder 6 is positioned at the rear of the passenger-side bank, making access somewhat challenging. Start with scan tool diagnosis before physical inspection. The ES350's ignition coils are designed for easy swap-testing between cylinders.