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Thread: Oxygen sensor substitutes - Revisited

  1. #1

    Default Oxygen sensor substitutes - Revisited

    Went to Oreilly Autoparts tonight and picked up the Bosch 13942 Oxygen Sensor (for a 1990 Ford Taurus, 5.0 liter Mustang, etc). Here is my question:

    -From past posts everyone says you can use this sensor. But it is only a 3-wire sensor. The 1991 535i has a 4 wire. The 4th wire on the BMW sensor is Grey -- I am assuming that is ground? So will this 3-wire Ford sensor work? Do you just not use the gray wire on the original BMW Oxygen Sensor harness?

    Thanks
    Jeff
    1991 535i

  2. #2
    Join Date
    Feb 2004
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    4,892

    Default

    You need to get the one with 4 wires... any 4 wires O2 sensor wil work.

  3. #3

    Default

    Well, all the e34 535's have a 4 wire sensor. And from the posts I have read by those who have gotten the Ford 13942, they have not had any problem making it work. So I just need to know how they have gotten it to work when it is only a 3 wire sensor.

    Thanks!



    Quote Originally Posted by Tiger
    You need to get the one with 4 wires... any 4 wires O2 sensor wil work.

  4. #4
    Unregistered Guest

    Default

    Can anyone who had posted that they used the Ford sensor answer the question about the 3 vs. 4 wire issue?

  5. #5
    Join Date
    Jan 2004
    Location
    Tampa Bay, Florida, USA
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    898

    Default Oxygen Sensor Wiring

    Here's a wiring diagram for the different O2 sensors from NTK:
    Attached Images Attached Images  
    Ramon
    1994 540iA Nikasil EAT Chip
    Tampa Bay, Florida USA

  6. #6
    Join Date
    Jan 2004
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    Tampa Bay, Florida, USA
    Posts
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    Default

    4 Wire has a sensor ground while a 3 wire does not. If you were to adapt a 3 wire to a 4 wire, you would have to make sure you had the sensor ground wire coming from the computer properly grounded.
    Ramon
    1994 540iA Nikasil EAT Chip
    Tampa Bay, Florida USA

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