A P0306 trouble code on your 2020 Lexus IS indicates a misfire condition on cylinder 6. The 2020 Lexus IS offers V6 power in the IS350 and IS300 (in certain configurations), making this code valid for those variants.
2020 Lexus IS Engine Options
The 2020 IS lineup includes:
- IS350: 3.5L V6 (311 hp) - P0306 is a valid code
- IS300 RWD: 2.0L turbocharged 4-cylinder - P0306 would be anomalous
- IS300 AWD: 3.5L V6 (260 hp) - P0306 is a valid code
If you have an IS350 or IS300 AWD, this code indicates a genuine cylinder 6 misfire requiring diagnosis.
Common Causes in the IS V6
- Ignition Coil Failure: Direct ignition coils can degrade or fail suddenly
- Spark Plug Wear: Iridium plugs may need replacement after extended use
- Fuel Injector Issues: Direct injection system problems
- Carbon Buildup: Intake valve deposits affecting valve sealing
- Vacuum Leaks: Intake system air leaks near cylinder 6
- Mechanical Issues: Low compression from valve or piston problems
IS V6 Engine Layout
The IS's 3.5L V6 is mounted longitudinally in RWD configuration. Cylinder 6 is at the rear of the right (passenger) bank, requiring reaching over the engine for access.