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In the 4 cyl it is the sensor after the cat in your exhaust. In the 6 cyl it depends on which bank. Bank 1 is the bank with cyl #1 and follow that exhaust pipe to the second sensor and if it is bank 2 then that is the one with the #2 cyl and the second sensor in that part of the exhaust (the one after the cat). The wires may unplug in under your seat too depending on which motor you have.