The 2020 Lexus IS offers the 3.5-liter V6 engine in IS 350 models producing 311 horsepower. This naturally aspirated V6 includes cylinder 5 as a legitimate position. A P0305 diagnostic trouble code indicates the engine management system has detected a misfire at this cylinder.
Understanding P0305 on IS V6
The P0305 code signifies "Cylinder 5 Misfire Detected." On Toyota/Lexus 3.5L V6 engines (2GR-FSE/2GR-FKS), cylinder 5 is positioned on the driver's side (left bank) as the middle cylinder. The V6 configuration in the IS provides excellent power and refinement.
IS 350 vs IS 300 Clarification
The 2020 IS 300 uses a turbocharged 4-cylinder engine where P0305 would be anomalous. The IS 350 with V6 makes P0305 a legitimate code. Verify your specific model before proceeding with diagnosis.
Common Misfire Causes
Cylinder 5 misfires on the IS 350 typically result from ignition coil degradation, spark plug wear, fuel injector malfunction, or mechanical issues. The 2GR engine family is generally reliable with proper maintenance.
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