The Lexus IS350 typically uses two catalytic converters—one on each bank of its 3.5-liter V6 engine. This article explains that arrangement and how it can vary by model year and market.
Two-converter layout: what you need to know
The IS350 operates with a V6 engine in which the exhaust is split into two banks. Each bank feeds its own catalytic converter, resulting in a total of two units. This design helps meet emission standards while fitting within the car’s under-hood packaging. Oxygen sensors monitor the performance of each catalyst to ensure proper conversion efficiency.
Model-year and market variations
The standard two-catalytic-converter configuration is typical for IS350 models equipped with the 2GR-FSE 3.5-liter V6 found in many regions (North America, Europe, and parts of Asia). While this is the common setup, always verify with vehicle documentation or a VIN-specific service diagram, as minor variations can exist between markets or special editions.
How to verify for your vehicle
To confirm the exact exhaust catalyst layout for your IS350, consult the official service manual or use a VIN-based parts diagram from an authorized dealer or OEM documentation. This ensures you’re looking at the correct configuration for your year, trim, and market.
Maintenance and replacement implications
When replacement is required, you’ll typically replace both catalysts to maintain emissions performance and engine efficiency. If only one catalyst is replaced, downstream sensors and engine control strategies may be affected. Labor and part costs vary by market and whether you choose OEM or aftermarket components.