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I have only found one, and replaced it (after code 43 found). On my 95 Chevy Lumina APV, the sensor was at the front center at bottom of the engine (which is mounted sideways), in the space between the starter and AC lines. Just look for the one wire coming off it down into the wire harness.
I had to bend the AC line over about a 1/16 to get the unit out cleanly, and make sure i would be able to get the new one in without mucking the threads.
I still have the same performance issue (haven't read the code since), and have to wonder if there is a second one, or a wiring issue. (will check those options tomorrow)

Tools: 7/8 deep socket with extension and a wooden pry stick for AC line. (and lift, or jack and stands)

steve at branchadventures dot org

Good luck

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