How many O2 sensors does a Honda Odyssey have?
Typically, four oxygen sensors are installed on Honda Odyssey models with the 3.5-liter V6—two upstream and two downstream, one on each exhaust bank. Across model years and regional variants, this four-sensor configuration has been the standard for most Odysseys using the J35-based engine, and this article explains the layout and what to know when inspecting or replacing them.
Standard O2 sensor layout
The Odyssey’s exhaust system features two banks (Bank 1 and Bank 2). Each bank has one upstream O2 sensor before the catalytic converter and one downstream sensor after it, totaling four sensors.
- Bank 1 Upstream O2 sensor (pre-cat) near the exhaust manifold for Bank 1.
- Bank 2 Upstream O2 sensor (pre-cat) near the exhaust manifold for Bank 2.
- Bank 1 Downstream O2 sensor (post-cat) after the catalytic converter for Bank 1.
- Bank 2 Downstream O2 sensor (post-cat) after the catalytic converter for Bank 2.
In most Odysseys, the wiring harness runs along the underbody and the sensors are accessible from beneath the vehicle for inspection or replacement. You’ll typically replace sensors in pairs if you’re balancing bank operation or checking for misfires or fuel economy concerns.
Diagnostics and maintenance considerations
Common O2 sensor faults include sluggish response, intermittent readings, or codes such as P0130–P0134 (codes vary by sensor and year). If replacing, verify you’re using the correct part number for your engine year and market, and consider whether heated sensors are required for faster startup and response.
Bottom line: for the Honda Odyssey, expect four O2 sensors in ordinary configurations, arranged as two upstream and two downstream sensors, one per bank.
Summary: The Honda Odyssey typically uses four oxygen sensors, reflecting its dual-bank V6 exhaust layout. This four-sensor configuration is standard across generations, with variations mainly in sensor part numbers or wiring harness routing rather than the total count.
