Ok, I replaced the upstream oxygen sensor because that's what the diagnostics check indicated. I bought a Bosch OEM part # 13191 oxygen sensor and proceeded to replace the old one. Come to find out my old sensor has a 4 wire connection (2 white, 1 gray, 1 black) and the new one has only 2 (1 black wire, and 1 gray wire). I decided to go ahead and replace the sensor, but I replaced the new harness with the old one which has 4 slots. I inserted the black and gray wrires into the 4 slot harness and connected that end to the other. I'm not sure if I made the right connections or if crossed them, or I actually need a 4 wire connection. Do You have any idea on this?
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Saturday, May 5th, 2007 AT 8:07 PM