The 2009 Honda Pilot has two catalytic converters.
The Pilot uses a dual-cat exhaust system to meet emissions standards. One catalytic converter sits close to the engine (the close-coupled cat), while a second converter is located downstream along the exhaust path, typically before the muffler. Each cat is monitored by its own pair of oxygen sensors to support the vehicle’s on-board diagnostics and emissions control.
Where they’re located on the vehicle
In most US-spec 2009 Pilots, the close-coupled catalyst is mounted near the exhaust manifold on the engine side, with the second catalyst positioned further back along the exhaust line toward the middle or rear of the vehicle. The exact placement can vary by trim level or market, but the two-cat layout is standard.
Why two converters are used
The two-cat design provides staged emissions treatment and redundancy. It helps ensure effective pollutant reduction across a range of engine speeds and conditions, and it aligns with emissions regulations. Having two converters also helps minimize backpressure issues compared with a single, larger converter.
Maintenance and replacement considerations
If a catalytic converter fails, technicians often inspect both units, since performance issues can arise from either cat or from related sensors. Many owners opt to replace both converters in a single service to restore optimal exhaust flow and avoid future failures, though exact costs depend on parts quality and labor.
Common questions and caveats
While the standard US-market 2009 Pilot typically features two catalytic converters, variations can exist for other markets or special editions. If you’re unsure, verify with the vehicle’s VIN or consult Honda’s service documentation for your region.
Summary
Bottom line: a 2009 Honda Pilot generally uses two catalytic converters in its exhaust system—one close to the engine and one downstream—each working with oxygen sensors to control emissions and support diagnostics.