The P0303 diagnostic trouble code on your 2024 Lexus ES indicates the powertrain control module has detected consistent misfires in cylinder 3. The 2024 ES continues with proven Toyota powertrains refined for luxury performance.
2024 ES Engine Options
The 2024 ES 350 features the 3.5L V6 with D-4S dual injection. The ES 300h uses a 2.5L four-cylinder hybrid system. On the V6, cylinder 3 is at the rear of the left (driver's side) bank. The hybrid's inline-4 positions cylinder 3 third from the front.
Common Causes
- Ignition Coil Problems: Individual coil-on-plug failures
- Spark Plug Condition: Iridium plugs eventually wear
- Fuel Injector Issues: D-4S has both direct and port injectors
- Carbon Accumulation: V6 direct injection can cause deposits
- Vacuum Leaks: Intake system integrity issues
Diagnostic Process
Identify your engine type first. Connect Lexus diagnostic equipment for detailed data access. Monitor misfire counts and fuel trim values. Test ignition components through systematic swap testing.
Repair Recommendations
Replace faulty ignition coils with Denso OEM parts. Install Lexus-specified spark plugs. Address fuel injector problems through cleaning or replacement. For V6 models with carbon buildup, professional cleaning may be warranted.