![]() ![]() The downstream O2 sensor in Odyssey is located further down the exhaust system, after the catalytic converter, and is responsible for measuring the level of pollutants passing through the catalytic converter. Downstream O2 sensors do not affect engine performance Any fault in this sensor can cause all sorts of performance issues in your Odyssey. The upstream O2 sensor helps in maintaining proper air to fuel ratio in the combustion chambers for maximum fuel efficiency and engine performance. But the most important one is the upstream O2 sensor, the one that is closest to the engine, usually in the exhaust manifold. ![]() There are multiple O2 sensors in Honda Odyssey, how many depends on vehicle configuration and model year. If you feel there is anything that you could do to improve or add to this article, please leave a comment below.Upstream and downstream O2 sensors Upstream O2 sensors are important for engine performance Most of the time, it’ll be the O2 sensor or the wiring to it. There are a lot of issues that can cause P0134 in the Honda Odyssey. By giving the engine’s computer the wrong info about how warm it is, it can throw the feedback loop of between the it and the sensor.
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