Alright its been a long journey so I will give you the short version. Car was dead for 2 years, some what stock rebuild, since she was brought back to life she has been pulling codes like a hooker pulls tricks .

Code 1 = #23 IAT , replaced sensor twice

Code 2 = #21 O2 , replaced upstream twice ( down stream next)

Code 3 = #17 temp 2 low 2 long , already replaced small brass sensor

Code 4 = #51 lean ,

Now I have also had others pop up like throttle pos,IAC,Injector codes you name it and its more than likely popped up. I have had a few people tell me that it could be my ECU (but I'm not suposed to post about ECU's lol) but anyway if any of you fine people can help please do .Thank you

The Temp 2 low is the ECT sensor the big one on top, right above the small brass one, you just changed the temp sending unit for the gauge. Replace the ect And it should fix the code.

Check your wiring on the o2 sensor. I replaced mine and it still said it was too lean, I replaced it twice before I checked the wiring. It was fine after it was wired up correctly.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

The wiring should be good because I got a direct fit so I didnt have to wire it in .

Did you unhook the battery for a few minutes? My o2 harness didn't have any voltage at all until I reset the ECU, then it seemed to work fine. I reset it with my brother's OBDII scanner, but it still wouldn't work. I had to actually unhook the battery.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

Well ill be damned it was the ECT,the cheapest damn part and I do it last . Changed the damn thing out and all codes went away.

Yay points for me.

better than some... Greater than most