Two catalytic converters. The 2008 Ridgeline's 3.5L V6 uses a dual-cat exhaust setup with one converter on each bank of the engine, followed by the rest of the exhaust system.
This article explains the standard configuration for this model, where the converters are located, and what that means for maintenance and replacement considerations.
Count and configuration
Here is a quick breakdown of the catalytic converter setup on the 2008 Ridgeline.
- Total number: Two catalytic converters in the exhaust system.
- Placement: Typically one converter on each bank of the V6 engine, located close to the engine (close-coupled) with a second converter further downstream in the exhaust path.
- Function: Each converter reduces pollutants from its respective bank before exhaust gases continue through the rest of the exhaust system.
- Sensors: Expect oxygen sensors positioned upstream and downstream of each converter to monitor performance.
In short, the standard configuration for a 2008 Ridgeline is two catalytic converters, one for each bank of the V6 engine.
Location and layout
Close-coupled versus downstream converters
On most 2008 Ridgeline models, the first converter sits near the exhaust manifolds for rapid heat-up, while the second converter is located further back along the mid-pipe. The two-catalyst design aligns with Honda's emissions strategy for the J35A-based engines.
Maintenance and replacement considerations
OEM vs aftermarket options
When replacement is needed, you can choose OEM (Honda) or aftermarket catalytic converters. The decision affects fit, warranty, and emissions compliance. Have a professional diagnose the issue to determine if one or both converters require replacement, and check for any upstream issues like misfires or sensor problems that could affect cat performance.
Summary
The 2008 Honda Ridgeline generally has two catalytic converters—one for each bank of the V6 engine—forming a two-cat exhaust arrangement that’s common for this vehicle. Understanding their placement helps with diagnosis and maintenance, and ensures proper emissions performance.