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O2 sensor position on 1991 240 (non-Cali) 200 1991

posted by  Karaboo77 on  Tue Oct 31 11:23 CST 2017
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I had the exhaust replaced several years ago by a local garage (it was 20 below when it went out) and need to put new cat, O2 sensor and front pipe on. I thought I remembered the sensor mounted in the front pipe, but the parts I pulled have the pipe plugged and the sensor in the catalytic converter.

Which hole do I plug, and which hole takes the O2 sensor?








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    O2 sensor position on 1991 240 (non-Cali) 200 1991

    uid 27's pic
    posted by  Art Benstein on  Tue Oct 31 15:24 CST 2017
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    last visit: Fri Oct 17 20:10 CST 2014
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    It really doesn't matter. I mean, if the sensor wiring reaches both locations, which it should without different oxygen sensor part numbers, and you're talking about oxygen sensor bungs (not the test port visible from the right side of the car), it makes no difference to the operation of the system whether the oxygen sensor is in the front of the cat or in the back of the downpipe.

    Given there are so many (at least three) cat configurations used in the 90's 240s, and the confusion with the pipes made for EGR (Cali) it is best you just choose what fits, i.e. a spin flange cat if that's the kind of pipe you have now. Plug whichever hole doesn't have the sensor in it.
    --
    Art Benstein near Baltimore

    Don't be irreplaceable. If you can't be replaced, you can't be promoted.







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