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I have a similar 02 problem with a 4 wire, same colors. The responses to this post really haven't helped me out. I don't really need to know which wire is which, i need to know which one to connect. Knowing this wire is signal, etc, isn't helping me connect the right four together. I could use some info like black-white/red, and so on.


Put the two prior replies together and you should have the answer, the first one shows the connections at the ECU and in the factory harness, the second one shows the O2 sensor connections.

If that does not help, I put them together for your convenience below:

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Black - goes to ECU OX1 terminal = O2 Signal+ = Blue wire

Brown - ground = O2 Signal- = White wire

Pink/green stripe - goes to HT1 (heater) terminal on ECU = O2 Heater = Black wire

White/red stripe - +B (battery) from EFI main relay = O2 Heater = Black wire

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