Most Honda Odyssey models use two catalytic converters in the exhaust system, typically arranged as a front (pre-cat) near the engine and a second downstream converter in the exhaust path.
This article explains where they are located, how the two-cat setup works, and what variations you might encounter across model years or markets. It also offers guidance on how to verify the exact configuration for your specific vehicle.
Typical two-cat layout in the Odyssey
The standard Odyssey exhaust setup has traditionally included two catalytic converters. Understanding their placement helps with diagnostics, maintenance, and potential replacements.
- Upstream catalytic converter (pre-cat) located close to the exhaust manifold on the V6 engine. This converter begins the emission-control process as soon as exhaust leaves the engine.
- Downstream catalytic converter (main cat) situated further back in the exhaust system, typically after the mid-pipe and before or near the resonator. This provides the second stage of emissions reduction.
Before listing the locations, note that the two-cat arrangement is common, but exact routing can vary by model year and emissions package.
In practice, both converters are part of the vehicle’s exhaust path, and many maintenance or replacement scenarios involve addressing one or both units depending on diagnostic results.
Variations by model year and market
Across most U.S.-spec Honda Odyssey models and other markets with the J35/V6 engines, the two-cat layout has been standard for many years. However, there can be differences based on model year, trim level, and regional emissions requirements. Always verify the exact configuration for your vehicle using the VIN, service manual, or by consulting a Honda dealer or qualified mechanic.
If you’re planning inspections, replacements, or theft-prevention measures, confirming the precise number and location of catalytic converters on your specific Odyssey is essential, since some variants may differ slightly in routing or mounting.
How to confirm the exact configuration on your Odyssey
- Identify your model year and trim level to determine the typical exhaust layout for that configuration.
- Visually inspect the exhaust system from the engine bay and underneath the vehicle to count the converters. The upstream cat is closest to the engine; the downstream cat is further back along the exhaust path.
- Consult the official service manual or a VIN-based parts database to confirm the emissions package and converter count for your exact vehicle.
- Ask a Honda dealership or certified mechanic to verify the number of catalytic converters using the VIN, especially if you’re considering replacement work.
Use these steps to verify how many catalytic converters your specific vehicle has:
In most cases, a Honda Odyssey will have two catalytic converters, but always confirm for your specific vehicle to avoid incorrect part selection.
Summary
The Honda Odyssey commonly uses two catalytic converters—one upstream near the engine and one downstream in the exhaust path. While this two-cat setup is typical for many model years and markets, variations can occur. To be sure, verify with your VIN, the service manual, or a Honda dealer. This ensures accurate maintenance, replacement, and maintenance planning for your specific Odyssey.