JPsToyota;1801587 said:Well now that somebody else helped you, maybe now you or someone else can help me.
The primary O2 sensor goes to a grey connector IIRC. Where does that connector lead to?
MightyAl;1801615 said:I am not sure that I understand your question. I am going off memory and on the 4 wire O2 sensor there is signal power, heater power, heater ground, and signal. The heater power is 12v source and ground goeas to a grounding point. The signal goeas back to the ECU and I can't remember if the signal power is 5v or 12v. If it is 5v it would come from the ecu. If that doesn't help then provide some clarification.