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    Cheap 4 wire o2 retrofit

    I have seen a lot of questions about weather all 4 wire o2 sensors are the same. Well, I found out they are not. The sensors operate on different frequencies, so not all 4 wires are the same.

    I found this out after my o2 retrofit, I was getting an o2 code for a long time, along with a lambda #1 code and engine speed code. One I got the engine speed code fixed I have not gotten any other codes since then.

    I have put about 300 miles on this new o2 senser and have not gotten a code.

    First off, I went to Advanced Auto Parts and got a bosch o2 sensor part number 13275 Its supposed to be for a Chrysler concord or Dodge intrepid I think.

    Cost me $45 vs the $100 they wanted for the BMW sensor.



    Procedure:

    Here are the two o2 sensors next to each other. Top is an OBDI s50 sensor, below is the $45 sensor.



    Although it shouldnt matter, mark one of the white wires so you can put them back together correctly. All I did was look at the o2 sensor from the wire side. I put the black wire up top, white to the left and right, and grey blow. That way I knew the marked one should be the left white wire when looking at the new o2 sensor with the black one on top.



    Cut



    Strip and be sure to leave the heat shield for the wire on.



    I found the best way to connect the two wires, was to get a 4 pin power plug, male and female, from rat shack. I think it was like $2 in parts. It should be straight forward. Crimp the plugs onto the wires then smush them in the plastic housing.

    MAKE SURE THE WIRES ARE CRIMPED IN WELL, one of mine came out and caused some problems. Just tak a volt meter and make sure its all together. Give them a little tug once they are in the housing to make sure they do not slip out.

    I originally tried to solder them together, I dont know what the hell kind of wire this is but it will not solder. I tried flux and everything it just wouldnt stick.

    Heres the two parts



    And the final cable



    The red wire with the yellow nut is a tap on the black wire that I used to connect my AFR guage up to.

    Now just screw it back in, plug it in, and go.

    This worked for me, I dont know if it will work for you. But you can try it I guess.
    Rollin' with a Geistkuchen

    #2
    Cool guy

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      #3
      great writeup... truly helpful!

      do you mind if I photoshop your receipt and return my busted one for a warranty replacement?

      kidding! joking... kidding! :D

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        #4
        hmm... Shouldn't 2 of those wires be the heater wires? they should be shielded and bundled together in a gray insulation....
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          #5
          Yes the white ones are. According to bosch it dosnt matter which one is + and which one is - I just kept them the same.
          Rollin' with a Geistkuchen

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            #6
            The 4 wire I bought was for a 1990 Ford 5.0 Mustang and it works great.

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              #7
              Yea, I run a motorcraft 4 wire in my eta with motronic 1.3

              All o2 sensors are basically the same, just to connectors are different. I would not hesitate to do it again.
              Old and improved:

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                #8
                Good write up!

                '87 325 (Track Rat)
                '04 C5500 Wrecker (Work)
                '94 525i (Daily)
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                H&R Race, Racing Dynamics Sway Bars, Tree House CAB's, Sparco Strut Bars and more.

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                  #9
                  Originally posted by EtaSport
                  Yea, I run a motorcraft 4 wire in my eta with motronic 1.3

                  All o2 sensors are basically the same, just to connectors are different. I would not hesitate to do it again.
                  No, their signal outputs can be different. I think I lucked out on this one though. I have heard other people say the ford ones will work.
                  Rollin' with a Geistkuchen

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                    #10
                    Originally posted by EtaSport
                    All o2 sensors are basically the same
                    Old and improved:

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                      #11
                      anyone know if the universal o2 sensors on ebay will work? they say they can be used on my car.
                      1991 318is ---230K - DD
                      1991 318i ---- 308K - retired

                      Originally posted by RickSloan
                      so if you didnt get it like that did you glue fuzzy oil to the entire thing?

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                        #12
                        Originally posted by jrobie79 View Post
                        anyone know if the universal o2 sensors on ebay will work? they say they can be used on my car.
                        www.autohausaz.com part #13942 is 3 wire o2 sensor thats what a have on my eta, just splice the connector from Your o2 sensor to the new one is a $35 part and it works fine. Make sure You have the 3 wire sensor.

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                          #13
                          For some reason all I see for pictures in the "red X"

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                            #14
                            On my site you can search using your model and it will show an universal applications that exist. For some models there is not a universal application so it's good in that you don't have to guess as to whether it will work or not, it will not simply show parts that might not work.

                            Also, if you have the Bosch P/N you can use that to search the site. If the part does not come up using that P/N then it is not available through my site.

                            Cheers.
                            Jack Money
                            http://www.Elephant Motorsports.com

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                              #15
                              ok, so would teh concord/intrepid o2 sensor work for a 318iS? Thanks
                              sigpic

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