Hi, I had a pr3 ecu, and switched to a pwo, now I have a code #2. I heard the pwo needs only one o2. I disconnected the o2, and reset the computer, and I still have the code. Could I have just had a o2 sensor go out at the exact time I put in the other computer? With a pwo does it have to have only 1 o2, or can I run 2? Because the hasport harness always has a extra wire for the second o2, and if it was for a car with a pwo, they would make a option, with or without second o2 sensor. As you can see I am kinda confused, help me. I hope you understand this. Thanks Ryan

 

OK, I just read that both computers need 2 o2's. So, I need some new o2 sensors? Its just weird that they went bad at that time. Ryan

 

Maybe it was already bad but your ECU didnt pick it up?? Maybe something wrong with the old ECU??

 

Hmm, yea, both possible. Is is bad to drive it like this? Ryan
Will my 89 si o2 work if I splice it in for the one with the opposite connection? And the other o2 will be plug and play, right. Thanks Ryan

 

bump