The 2022 Lexus IS offers multiple engine configurations: the IS 300 with turbocharged 4-cylinder, IS 350 with 3.5-liter V6, and the IS 500 with 5.0-liter V8. Both V6 and V8 models include cylinder 5 as a legitimate position. A P0305 diagnostic trouble code indicates misfire detection at this cylinder.
P0305 Code Analysis by Model
P0305 is valid on IS 350 (V6) and IS 500 (V8) models. On the IS 300's turbocharged 4-cylinder, P0305 would be anomalous since only cylinders 1-4 exist. Proper model identification is essential for accurate diagnosis.
IS 350 V6 Diagnosis
The 3.5L V6 in the IS 350 produces 311 horsepower. Cylinder 5 misfires typically result from ignition component wear, fuel injector issues, or in rare cases, carbon buildup on this direct injection engine's intake valves.
IS 500 V8 Considerations
The 5.0L 2UR-GSE V8 produces 472 horsepower. Cylinder 5 on this high-revving naturally aspirated V8 is subject to greater stress during spirited driving. Premium ignition components are essential for reliable operation.
Diagnostic Approach
Lexus Techstream diagnostics provide comprehensive cylinder-specific data for accurate diagnosis regardless of engine configuration.