It has two catalytic converters.
The 2008 Honda Odyssey, equipped with the J35A V6 engine, uses a two-piece catalytic converter layout designed to curb emissions efficiently as the exhaust travels from the engine toward the tailpipe.
Where the converters sit and how they function
Here’s a simple rundown of their locations and roles to help with diagnostics, maintenance, or repair decisions.
- Close-coupled catalytic converter — mounted near the engine, typically on the exhaust manifold or first downpipe, designed to reach operating temperature rapidly for effective pollutant conversion.
- Main (rear) catalytic converter — located farther back in the exhaust line, downstream of the first cat, providing the second stage of emissions treatment before the exhaust reaches the resonator/muffler in some configurations.
In typical factory setups for the 2008 Odyssey, these two units work in series to meet emissions standards across varying engine loads and temperatures.
Maintenance and diagnostics
If you notice symptoms like degraded fuel economy, a sulfurous exhaust smell, or a check engine light pointing to catalytic converter efficiency (codes such as P0420 or P0430), a professional diagnostic is recommended. Replacement decisions usually depend on the measured efficiency and the specific fault codes, and in many cases both converters are replaced if multiple failures or age-related wear are detected.
Summary: The 2008 Honda Odyssey generally features two catalytic converters in the exhaust system, arranged as a close-coupled unit near the engine and a secondary unit further back, working together to reduce emissions.