The oxygen sensor for bank 1 sensor 1 is located just behind where the exhaust pipes from the front bank of cylinders and rear bank of cylinders join up. If you look under the car from the front and follow the exhaust pipes, it is the one you can see easily. There are only two oxygen sensors on the car---the one described above is bank 1 sensor 1. The other sensor goes into the side of the catalytic converter. It is bank 1 sensor 2.
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