How many catalytic converters are in a Lexus GX470?
The Lexus GX470 uses two catalytic converters—one for each exhaust bank. This dual-cat arrangement is standard for this V8 SUV and plays a key role in emissions control across model years.
Exhaust design and converter layout
The GX470 is powered by a 4.7-liter V8 (the 2UZ-FE). Its exhaust system follows a dual-bank design, with a catalytic converter on each bank before the exhaust merges toward the tailpipe. This configuration helps ensure efficient emissions reduction and optimal engine performance across different driving conditions.
Key details about the converter setup include the following:
- Two catalytic converters in total — one on each exhaust bank (left and right).
- Each converter typically sits along the respective exhaust path, close to the engine or along the underbody, depending on the production year and trim.
- Each converter is paired with its own oxygen sensors (upstream and downstream) to monitor catalytic efficiency.
When properly maintained, this dual-cat arrangement supports emission standards and diagnostic monitoring for the GX470. If a converter fails, it can affect performance and trigger emissions-related trouble codes; many owners replace both to restore balanced performance and pass regulatory checks.
Maintenance and diagnostic considerations
Common maintenance steps focus on preserving catalytic efficiency and preventing exhaust leaks. Here are typical considerations for the GX470's two-cat system:
- Regular inspection of heat shields, clamps, and oxygen sensor wiring around the exhaust paths.
- Diagnostic checks for codes such as P0420 or P0430, which indicate catalytic efficiency concerns on one or both sides.
- Assessment of performance symptoms (loss of power, reduced fuel economy, sulfur or rotten-egg smell, or unusual exhaust noise) which can accompany a failing cat.
In most cases, if one catalytic converter fails, replacement may involve both converters to maintain balanced emission control and avoid mismatched flow that can trigger additional codes.
Summary
In summary, a Lexus GX470 is equipped with two catalytic converters—one on each exhaust bank. This dual-cat setup, paired with dedicated oxygen sensors, supports emissions performance and regulatory compliance across its production years. Regular maintenance and diagnostics help ensure both converters function correctly.
How much does it cost to replace a catalytic converter on a Lexus GX470?
The average cost for a Lexus GX470 Catalytic Converter Replacement is between $3,031 and $3,076.
What are two symptoms of a failed catalytic converter?
Check for symptoms.
As mentioned, common symptoms of a clogged catalytic converter include an illuminated check engine light, trouble starting the car, poor acceleration, a smell of sulfur or rotten eggs, engine misfires, and poor fuel economy.
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 much are Toyota catalytic converters worth scrap per?
The actual value you get for your Toyota catalytic converter depends on your car model and the size and weight of the catalytic converter, and the price can range from $75 to $700 when sold as scrap.
