How many catalytic converters does a Lexus IS 300 have?
The Lexus IS 300 typically uses two catalytic converters in its exhaust system: a close-coupled converter near the engine and a secondary converter downstream. This dual-cat setup is standard for the IS 300 models that used the 3.0-liter inline-six and is designed to meet emissions requirements while preserving performance. Depending on the exact model year or regional variant, configurations can vary, so checking your vehicle’s documentation or VIN is the most reliable way to confirm for your car.
Typical two-cat configuration
In the common IS 300 layout, the exhaust path includes a close-coupled catalytic converter mounted near the exhaust manifold and a second catalytic converter placed further back along the exhaust line. Both units work together to reduce pollutants across a broad operating range and are integrated with sensors that feed data to the engine control system.
Design reasons
Two catalytic converters help ensure thorough emissions control and maintain proper exhaust flow. The close-coupled cat starts the reduction process early, while the downstream cat completes the job as exhaust continues toward the tailpipe.
Model-year and market notes
For the IS 300 lineup that used the 3.0L inline-six, two catalytic converters are the standard configuration. Variations can occur based on market specifications or engine updates, so it’s advisable to consult official documentation or a Lexus dealer if you need a VIN-specific confirmation.
How to verify on your vehicle
To confirm the number of catalytic converters on your exact car, you can:
Inspect the exhaust system under the vehicle for two catalytic converter units along the pipe, typically located between the exhaust manifold and the muffler.
Review the owner's manual or service documentation for the exhaust configuration of your model year.
Ask a Lexus technician or reference the VIN-specific parts diagram to identify the exact count.
In practice, most IS 300 models built with the traditional inline-six powertrain feature two catalytic converters. If your vehicle has a different setup, official documentation or a factory parts diagram will provide the definitive answer.
Summary
Bottom line: The Lexus IS 300 most commonly has two catalytic converters—one near the engine and another downstream. Always verify with your specific vehicle’s documentation or a trusted dealer to account for any market- or year-based variations.
Are Lexus targeted for catalytic converter theft?
Other hybrids are also target for catalytic converter theft. This includes Honda, Lexus RX, and the Toyota Auris.
How can I tell how many catalytic converters I have?
Look Under Your Vehicle
First, take a look at the number of exhaust banks you have. Typically, each bank will contain a single catalytic converter. This is a quick and simple way to determine how many catalytic converters your car has.
How much does it cost to fix a catalytic converter on a Lexus?
The average cost for a Lexus RX350 Catalytic Converter Replacement is between $2,304 and $2,478. Labor costs are estimated between $371 and $544 while parts are typically priced around $1,933.
How many cats does an IS300 have?
IS300s have 3 catalytic converters, I don't know what the guys in this thread are smoking. That said, only the two in the headers will cause a code, the third is perfectly fine if you leave it hollowed out.
