The 2006 Honda Ridgeline has two catalytic converters.
For the 2006 Ridgeline, Honda used a two-converter exhaust layout — a close-coupled unit near the engine and a second downstream converter — to optimize emissions control across driving conditions and engine loads.
What this means for the Ridgeline’s exhaust system
Two catalytic converters share the exhaust flow in a typical Ridgeline setup: one is mounted close to the engine to heat up quickly, and the other sits further downstream in the exhaust path to provide additional emissions reduction.
- Close-coupled catalytic converter (pre-cat) near the engine, designed to heat up quickly and curb emissions early in the exhaust stream.
- Main catalytic converter located downstream in the exhaust path, handling the bulk of the emissions reduction as exhaust travels toward the muffler.
Knowing the dual-cat arrangement helps with diagnosis, replacement timing, and ensuring the system remains compliant with emissions standards.
Maintenance and regional variations
While two catalytic converters are standard for the 2006 Ridgeline sold in North America, configurations can vary by market, trim level, or California emissions requirements. If in doubt, check the VIN or inspect the exhaust path under the vehicle for two distinct converter units.
Summary
Bottom line: The 2006 Honda Ridgeline is equipped with two catalytic converters — a close-coupled unit near the engine and a secondary unit downstream — forming a dual-cat exhaust setup typical for this model year and engine family.
How many catalytic converters are on a 2006 Honda Ridgeline?
Major system components include two close-coupled catalytic converters, a secondary underfloor catalytic converter, a centrally positioned, high-flow resonator and a silencer.
How much does it cost to replace a catalytic converter on a 2006 Honda Ridgeline?
The average cost for a Honda Ridgeline Catalytic Converter Replacement is between $1,610 and $1,813. Labor costs are estimated between $273 and $400 while parts are priced between $1,337 and $1,413.
What are the most common problems with a 2006 Honda Ridgeline?
Owner Reported Trouble Spots
- Climate System. AC compressor, blower (fan) motor, condenser, evaporator, heater system, automatic climate system, electrical failure, refrigerant leakage.
- Electrical Accessories.
- Paint/Trim.
- Exhaust.
- Suspension/Steering.
- Noises/Leaks.
- Engine Minor.
- Drive System.
Can you unclog a catalytic converter instead of replacing it?
Unfortunately, cleaning your catalytic converter does not guarantee it will work effectively afterward. If your converter is defective, cleaning it will not make an impact, and any symptoms present before the cleaning process will return. In the end, if nothing works, a replacement is the way to go.