so let me explain my situation. i just bought an s2000. its a 2002 with a greddy smog legal kit and all. anyways it had a bad front o2 sensor (the wires pulled out of the plug and i couldnt get the wires right again so i just got a new one) well i replaced it with one i found on craigslist, yes it is used and is OEM. i totally trust the guy, hes really into s2000's and is super informative and all. anyways, it still throws the same CEL code saying "bank 1 sensor 1 oxygen sensor heater malfunction"

the car runs okay untill 5,500rpm and then it starts popping like no other, bogging out, etc. im positive its just running stupidly rich. now that ive tried two different o2 sensors, i believe the guy may have also pulled the wires out of the plug on the wire harness that the o2 sensor plugs into. if anybody could upload a picture of the plug with where the wires are located on it, as in a pin out diagram, or a simple photo of yours, i would be greatful!!!

also, i hooked up a scanner which would read live data and for those of you who know what the voltages on an o2 sensor should look like from live data view, mine was steady at 1.203 volts, never changed from there.

 

still no replies? you guys cant just jack up your car and take a picture for me?! man, go inspect and snap a pic :]

 

I would think you'd get an O2 sensor CEL if the wires were wrong. From the car harness, black and gray are the sensor wires in the top two sockets nearest the connector latch. The other 2 wires are both white and are for the heater. On cold start-up the two white wires should have 12 volts between them to heat up the O2 sensor. You can also measure the sensor and should see a low resistance between the heater wires, maybe 5 or 10 ohms I think.