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2002 Toyota rav4 o2 sensor bank 1 which one is it on the top?

There are two oxygen sensors on a 2002 Toyota RAV4.

The upstream oxygen sensor is located in the exhaust manifold, and the downstream oxygen sensor is located in the exhaust pipe.

The upstream oxygen sensor is the one that is used to control the air/fuel mixture, while the downstream oxygen sensor is used to monitor the efficiency of the catalytic converter.

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