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  1. #1
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    Default O2 sensor wiring

    I have a 1991 L98. I recently replaced the O2 sensor on the drivers side. There is only one wire going to the O2 sensors, there are 3 wires coming out of the harness. My problem is two of them were broken and I canít figure out where they go. I believe one is a ground, any suggestions on the other wire would be greatly appreciated. I canít find it on a wiring harness. Car ran better with one grounded, think it will run better if I find this connection.

  2. #2
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    Quote Originally Posted by mciamp99 View Post
    I have a 1991 L98. I recently replaced the O2 sensor on the drivers side. There is only one wire going to the O2 sensors, there are 3 wires coming out of the harness. My problem is two of them were broken and I canít figure out where they go. I believe one is a ground, any suggestions on the other wire would be greatly appreciated. I canít find it on a wiring harness. Car ran better with one grounded, think it will run better if I find this connection.


    How many wires were on the OEM sensor that you removed?
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  3. #3
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    91 VIN 8 uses single-wire sensors. The two broken wires likely go to some other device.

    If you have the Electrical Supplement to the 91 Factory Service Manual, you'll find a wiring diagram in that book.

  4. #4
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    I have the supplement manual. It does not identify them. As I said, one is a ground, can’t identify the other. The diagram in the supplemental manual does not identify them, at least I can’t see them in The diagram. All three wires look the same, 22 gauge black wire. For lack of a better solution I am going to ground it and see if that smooths everything out.

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