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There are typically two oxygen sensors, but as many as four on a standard vehicle.

Depending on model as some have one sensor, some have two and some have four of them, I would look just before and just after the catalytic converter. The sensor reads oxygen content and reports back to the Powertrain control module (computer) the one before and the one after have a different reading as the converter changes the content. The PCM evaluates and change the fuel air mixture to correct

Bank 1 is the side of the engine that includes cylinder number 1, bank 2 would be the other side. Sensor one is before the catalytic converter, sensor 2 would be after.

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13y ago
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Q: Where is the location of oxygen sensor?
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