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    #1

    02 Sensor wiring help.

    I'm having troubles with my o2 sensor wiring, sorry about the picture:



    From etm's I have been using says these wires are for the o2 sensor as it has 3 wires I bought a 3 wire o2 sensor.

    The earth wire was not completed ( went in and out of a plug that was not connected to anything, I cut the plug off and soldered the wires together to complete the earth circuit.

    Note: On the 02 sensors heater the wires are not polarity sensitive.

    The oil light stays on and the car has alittle bit of a lumpy idle now too?

    When you disconnect the earth wire the oil light goes out.

    Could you guys help me figure out my o2 sensor wiring?



    The plug to the far left is the one I cut off, the plug next to that is the o2 sensor plug I used.
    ///Monstrosity. (OO≡≡[][]≡≡OO)

    Aside from showing yourself to be offensive, lacking experience and ignorant in the ways of business, you're also illiterate and imprudent. Beyond that, your sense of liability is severely impaired.

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    #2
    Bump, c'mon guys tell me what colours your o2 sensor wires are? (harness side)

    m20, m30 harness just to give me an idea.
    ///Monstrosity. (OO≡≡[][]≡≡OO)

    Aside from showing yourself to be offensive, lacking experience and ignorant in the ways of business, you're also illiterate and imprudent. Beyond that, your sense of liability is severely impaired.

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      #3
      How about you get a 25$ bosch single wire O2 and only run the sensor wire to the dme,or just use yours and eliminate the others. The other wires are for a heater cuircut to warm up the sensor to enable closed-loop sooner and i think run through a relay. I did this on my e28 because the bmw sensor 3 wire heated sensor was 150$. I don't have my o2 sensor hooked up yet on my 335 either, but this is what i am going to .
      Last edited by BoostMW; 10-16-2008, 05:05 PM.

      Comment

        #4
        Originally posted by BoostMW View Post
        How about you get a 25$ bosch single wire O2 and only run the sensor wire to the dme,or just use yours and eliminate the others. The other wires are for a heater cuircut to warm up the sensor to enable closed-loop sooner and i think run through a relay. I did this on my e28 because the bmw sensor 3 wire heated sensor was 150$. I don't have my o2 sensor hooked up yet on my 335 either, but this is what i am going to .

        You just need to make sure it is grounded properly, as single wire grounds through the sensor body/exhaust. The corrosion in the exhaust parts can bitch up the signal...

        FYI, all pre-cat single wire thimble sensors are the same. The dual wire thimble sensors simply add a ground reference wire. Heated sensors (3 and 4 wire) can be either 12 or 18 watts, and be body or wire grounded, and you don't want to interchange them. This info only goes for pre-cat thimble sensors.
        Last edited by JGood; 10-16-2008, 06:00 PM.
        85 325e m60b44 6 speed / 89 535i
        e30 restoration and V8 swap
        24 Hours of Lemons e30 build

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          #5
          Hmmm, soo with my 3 wire sensor (sensor, heater and earth) could I hook up my sensor wire and use the earth wire too? Or is the earth only for the heater? I guess it would be, because in the instructions that came with my 3 wire sensor it says that the heater circuit is not polarity sensitive.

          Still would like to know which wires are for the heater and which are for the o2 sensor (for the ecu)

          BTW, thanks guys for replying.
          ///Monstrosity. (OO≡≡[][]≡≡OO)

          Aside from showing yourself to be offensive, lacking experience and ignorant in the ways of business, you're also illiterate and imprudent. Beyond that, your sense of liability is severely impaired.

          Comment

            #6
            If you need pinout for DME(ecu) let me know what year and model car your harness and dme are from and i can pull up the ETM as i work for a BMW dealership.

            Comment

              #7
              Yes, the ETM is a great resource...

              Free Phone System Manuals Voice Communications 800 593-6000
              http://wedophones.com/BMWManualsLead.htm
              85 325e m60b44 6 speed / 89 535i
              e30 restoration and V8 swap
              24 Hours of Lemons e30 build

              Comment

                #8
                Originally posted by JGood View Post
                Yes, the ETM is a great resource...

                http://wedophones.com/BMWManualsLead.htm
                Hmmmm, thanks!
                ///Monstrosity. (OO≡≡[][]≡≡OO)

                Aside from showing yourself to be offensive, lacking experience and ignorant in the ways of business, you're also illiterate and imprudent. Beyond that, your sense of liability is severely impaired.

                Comment

                  #9
                  hey,
                  i have had my 335i going for about 4 or 5 months now and never hooked up the o2 sensor at all and it runs fine without any problems.

                  Comment

                    #10
                    Originally posted by e30m30power View Post
                    hey,
                    i have had my 335i going for about 4 or 5 months now and never hooked up the o2 sensor at all and it runs fine without any problems.
                    Yes, but running this engine without an o2 sensor will make it use more fuel and foul up the catallic converter.
                    ///Monstrosity. (OO≡≡[][]≡≡OO)

                    Aside from showing yourself to be offensive, lacking experience and ignorant in the ways of business, you're also illiterate and imprudent. Beyond that, your sense of liability is severely impaired.

                    Comment

                      #11
                      Update:

                      Ok it seems that the GN/WS (Green with white tracer) is the o2's ecu signal wire.

                      Still do not understand how the heating circuit works though.
                      ///Monstrosity. (OO≡≡[][]≡≡OO)

                      Aside from showing yourself to be offensive, lacking experience and ignorant in the ways of business, you're also illiterate and imprudent. Beyond that, your sense of liability is severely impaired.

                      Comment

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