The 2006 Honda Odyssey has four oxygen sensors: two upstream sensors located before the catalytic converters and two downstream sensors located after them, one set on each exhaust bank.
Sensor count and layout
The following list shows the four sensors and their approximate locations on the 2006 Odyssey's exhaust system.
- Bank 1 Sensor 1 (upstream) — located on the Bank 1 exhaust manifold, before the catalytic converter.
- Bank 2 Sensor 1 (upstream) — located on the Bank 2 exhaust manifold, before the catalytic converter.
- Bank 1 Sensor 2 (downstream) — located after the catalytic converter on Bank 1.
- Bank 2 Sensor 2 (downstream) — located after the catalytic converter on Bank 2.
In short, the Odyssey has four O2 sensors total, arranged in pairs per exhaust bank to monitor both the air-fuel mixture and catalyst performance.
Maintenance and diagnostics
The following points provide guidance on maintenance and diagnostics related to the Odyssey’s O2 sensors.
- Symptoms and codes: If the check engine light comes on, diagnostic trouble codes related to O2 sensors (such as P013x or P015x families) may indicate a sensor issue.
- Performance indicators: A sudden drop in fuel economy, rough idle, or hesitation under acceleration can point to faulty upstream or downstream sensors.
- Expected lifespan: O2 sensors generally last about 60,000 to 100,000 miles, though harsh driving conditions or road salt can shorten life.
- Replacement guidelines: When replacing, use OEM or quality aftermarket sensors, apply manufacturer-recommended anti-seize on threads if applicable, and torque to spec.
Bottom line: If you suspect an O2 sensor issue on a 2006 Odyssey, diagnose with the vehicle’s OBD-II codes and inspect the sensors’ connections and wiring before replacing any part.
Summary
The 2006 Honda Odyssey uses four oxygen sensors in total—two upstream sensors before each catalytic converter and two downstream sensors after—one set on each exhaust bank. This setup allows the engine computer to precisely regulate fuel trim and verify catalytic converter efficiency, making timely maintenance and accurate diagnostics important for performance and emissions compliance.