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Thread: 2000 XJ 4.0 bank 1 O2 sensor delete?

  1. #1
    Join Date
    Dec 2012
    Location
    Worcester, MA
    Posts
    38

    Default 2000 XJ 4.0 bank 1 O2 sensor delete?

    I'm looking at options for a new exhaust system from the headers back. Now it seems that 99-01 the header setup utilizes 2 cats at the Y pipe from what I've seen but some for 99 don't have that setup. What I'm curious about is if the manifold was designed because of a new setup with the vehicle or if it was purely for emissions. Any of the pre 99 ones I've seen don't have 2 cats but a single O2 at the Bottom of the Y pipe, is it possible to reprogram the PCM to not see the code for the one missing or if I should just go with the factory setup.

    (Not trying to blow a ton of money on this.)

    If this is not possible I've seen various styles of manifold and various prices from 125-500 I added screen shots of some I'm interested in and if anyone has done this or purchased these how are the cheaper ones. I'm looking for functionality/quality not necessarily performance or styling.

    Addition thoughts on bank 2 cat (high flow?) and cat back systems who's got what and likes what? Good sound, no drone, and middle of the road price.

    Curious about quality on this if it's legit I will just go with the factory setup



    If I can delete one cat I'd like to go with something like this



    Any and all comments, questions, thoughts or down right don't do that and just get this whole system are welcome.




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  2. #2
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: 2000 XJ 4.0 bank 1 O2 sensor delete?

    The reason for the change is emissions control. The single pipe cat provides data for the whole engine. The dual pipe cat and two extra sensors allow the PCM to split the engine into zones and accommodate a difference n temperature from front to back. So, no, you cannot just delete one set
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    Join Date
    Dec 2012
    Location
    Worcester, MA
    Posts
    38

    Default Re: 2000 XJ 4.0 bank 1 O2 sensor delete?

    10-4! Ok so any thoughts on that manifold I posted for 125?


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  4. #4
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: 2000 XJ 4.0 bank 1 O2 sensor delete?

    I don't know anything about them. Seems like a cheap price
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  5. #5
    Join Date
    Dec 2012
    Location
    Worcester, MA
    Posts
    38

    Default Re: 2000 XJ 4.0 bank 1 O2 sensor delete?

    Ok I'll try and do some research to make a decision


    Sent from my iPhone using Tapatalk

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