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  1. #1
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    95 540iA 8cyl...how many Oxygen sensors? and...

    95 540iA with 8cyl.

    I'm getting conflicting information on the number of O2 sensors. Some info saying 2 pre-cat and 2 post-cat. There are 2 after market Bosch numbers too in many parts look-ups 13522 and 13523. However I can only see the 2 sensors in the cat area.

    Are there only 2 sensors after cat and if not, where are the pre-cat sensors. WWW.REALOEM.com only shows 2 near the cat.

    TIA


  2. #2
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    Re: 95 540iA 8cyl...how many Oxygen sensors? and...

    Two.
    AIM: yaofeng4249
    '95 525i 5 speed built 5/94 w/93 m50tu engine
    '94 540it built 3/93, converted to 6 speed w/a '93 e32 M60, 4.0L Nikasil engine
    '01 540it, built 6/01
    '03 325i 5 speed, built 9/02

  3. #3
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    Re: 95 540iA 8cyl o2so there are only 2 post cat?

    so there are only 2 post cat?

    I called BavAuto and they indicated there are 4...2 just before the cat facing upwards and 2 after going sideways.

    Other folks I talked to indicated any odbII car has both pre and post cat sensors.

    Any pictures of this area?

    I guess I'll find out for sure tomorrow when it is up in the air.

  4. #4
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    Member No: 10712 yaofeng is an unknown quantity at this point yaofeng's Avatar
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    Re: 95 540iA 8cyl o2so there are only 2 post cat?

    Check your build date and go here. I am almost sure all E34 M60's have two sensors. My E39 '01 540it has four.
    AIM: yaofeng4249
    '95 525i 5 speed built 5/94 w/93 m50tu engine
    '94 540it built 3/93, converted to 6 speed w/a '93 e32 M60, 4.0L Nikasil engine
    '01 540it, built 6/01
    '03 325i 5 speed, built 9/02

  5. #5
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    Member No: 89859 Smcdermott326 is an unknown quantity at this point Smcdermott326's Avatar
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    Re: 95 540iA 8cyl o2so there are only 2 post cat?

    Yeah REALOEM and dealer both confirmed only 2. BavAuto, AdvanceAuto and AutoZone all show upstream and downstream Bosch #'s. At AdvanceAuto, the REaloem OEM Part # for that sensor...cross references to 13523 only...which is downstream.

    There is no upstream that I can find in the diagram or elsewhere. Even though those parts look-up systems show both up and downstream.

    sometimes it is just very difficult to get accurate info from the part stores.

    thanks for your help

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