Two O2 sensors on four-cylinder models and four on V6 models. The exact count depends on the engine configuration in your 2002 Accord: inline-4 engines typically use one upstream and one downstream sensor, while the V6 setup uses two banks with a sensor on each side both before and after the catalytic converters.
The 2002 Honda Accord offered both a four-cylinder and a V6 engine. Because exhaust sensors map to each engine bank, the total number of O2 sensors depends on the chosen engine: 2 for the four-cylinder version and 4 for the V6 version. Upstream sensors monitor oxygen in the exhaust entering the catalytic converter, while downstream sensors help monitor catalytic converter efficiency.
Engine configurations and sensor counts
Summary of how sensor counts vary by engine configuration in the 2002 Accord.
Four-cylinder models (2 sensors)
In the 2002 Accord with the four-cylinder engine, you typically have two O2 sensors: one upstream and one downstream relative to the catalytic converter.
The following list shows common sensor locations for the 4-cyl engine:
- Upstream O2 sensor: located before the catalytic converter, usually mounted in or near the exhaust manifold.
- Downstream O2 sensor: located after the catalytic converter, along the exhaust pipe after the cat.
Two sensors in total on the four-cylinder models, providing basic monitoring of exhaust gas before and after the catalytic converter.
V6 models (4 sensors)
For the 3.0L V6 engine, the Accord commonly uses four O2 sensors: two upstream sensors (one for each bank) and two downstream sensors (one after each catalytic converter).
Locations typically include:
- Bank 1 upstream O2 sensor (pre-cat, Bank 1)
- Bank 1 downstream O2 sensor (post-cat, Bank 1)
- Bank 2 upstream O2 sensor (pre-cat, Bank 2)
- Bank 2 downstream O2 sensor (post-cat, Bank 2)
Four sensors in total on the V6 models, enabling monitoring of both exhaust paths.
How to confirm in your vehicle
To confirm the exact count for your specific car, check the owner’s manual or the factory service manual for your VIN. Visually inspect under the hood and along the exhaust pipes: O2 sensors have electrical connectors and are threaded into exhaust pipes or manifolds. If diagnosing sensor-related issues, codes such as P0130–P0134 or other O2-related codes may appear on an OBD-II scanner.
Summary
In short, the 2002 Honda Accord uses two O2 sensors on four-cylinder models and four on V6 models. Engine configuration determines the total, so verify based on your specific trim or VIN and consult official manuals or a trusted mechanic if you’re unsure.