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Air Fuel Ratio Gauge Hook-up

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  • Air Fuel Ratio Gauge Hook-up

    I've got everything hooked up now on my gauge panel except for the wire that goes from the A/F gauge to the O2 sensor. I'm not sure which wire coming out of the O2 sensor I have to hook the gauge up to. Does anyone know?

    Thanks

    David

  • #2
    nevermind, I found the answer in the M3 SIG archive courtesy of our friend Stan.

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    • #3
      i hooked mine upto one of the wires going into the ecu so as not to have to route it into the engine bay, i think it was a purple wire on one of the pins around 24-27 not sure, unfortunatly i no longer run motronic so i can't look.

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      • #4
        >>>i hooked mine upto one of the wires going into the ecu so as not to have to route it into the engine bay, i think it was a purple wire on one of the pins around 24-27 not sure, unfortunatly i no longer run motronic so i can't look.<<<

        Per the ETM it is Motronic pin # 24. A green wire at the ECU end fed by a black wire at the O2 sensor end. Pins 25-27 go to the cylinder and engine speed sensors on the bellhousing.

        Pin # 21 goes to a thin balck wire that is a good source of Engine RPM data if you need it for add on gadgets. I use it for my wide band O2 sensor datalogger.

        Stan

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        • #5
          thanks stan for expanding on my post, it is all coming back to me now, i remember being a black wire and 2 white wires on the o2 sensor.

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