The 2015 Honda Pilot typically uses two catalytic converters.
For the US-market 3.5-liter V6, the exhaust system normally houses two catalytic converters arranged in series: a primary (close-coupled) unit near the engine and a secondary (main) unit farther back along the exhaust path. This two-converter layout helps the vehicle meet emissions standards, with sensors monitoring performance before and after each converter. If you’re inspecting a specific vehicle, you’ll usually find two catalysts along the exhaust with associated oxygen sensors.
Converter count and placement
The following describes the standard arrangement for the 2015 Pilot's exhaust system.
- Primary (pre-cat): A catalytic converter mounted close to the exhaust manifold to initiate emissions processing early in the exhaust flow.
- Secondary (main cat): A second converter located farther back in the exhaust stream to further reduce pollutants before the exhaust exits the car.
In most US-spec 2015 Pilots, these two converters are connected in series along the undercarriage, with oxygen sensors placed upstream and downstream of the converters to monitor efficiency. Regional variations or aftermarket modifications can alter the exact layout.
Location and function
Where you’ll typically find them: the primary converter sits near the engine, with the secondary converter positioned along the midsection of the exhaust line toward the rear. Both use a ceramic substrate coated with precious metals to catalyze reactions that reduce carbon monoxide, hydrocarbons, and nitrogen oxides.
Maintenance considerations
Maintenance focuses on checking for leaks around the converters, ensuring heat shields are secure, and keeping oxygen sensors functioning so the system can accurately monitor catalytic efficiency. If one converter fails, replacement is commonly done in conjunction with the other to maintain emission performance.
Summary
For the 2015 Honda Pilot, two catalytic converters are standard: a close-coupled primary cat and a downstream secondary cat. This configuration supports emissions compliance across operating conditions, with sensors providing ongoing performance data.
What are the common problems of a 2015 Honda Pilot?
Premature pad/rotor wear, pulsation or vibration, antilock system, parking brake, master cylinder, calipers, squeaking, brake failure, regenerative braking.
How much does it cost to fix P0420 on a Honda?
Most Common Causes of P0420 Code
| Cause | Typical Repair Cost (USD) |
|---|---|
| Failing catalytic converter | $500-$2,500 |
| Faulty oxygen sensor (upstream or downstream) | $150-$400 |
| Exhaust leaks (manifold, pipes) | $100-$600 |
| Engine misfire (spark plugs, coils) | $100-$500 |
How many catalytic converters are on a 2015 Honda Pilot?
3
All 3 Manifold Catalytic Converter Set For 2009 - 2015 Honda Pilot 3.5L Direct Fit.
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.