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Will cracked manifold automatically throw code

Discussion in '4th Gen 4Runners (2003-2009)' started by esamos, Jul 10, 2024.

  1. Jul 10, 2024 at 8:04 AM
    #1
    esamos

    esamos [OP] New Member

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    If there is a cracked exhaust manifold, will a the check engine light, or another light, automatically come up and throw code or does it have to get worse to a point before that happens? And what is the difference between short and long tube headers from someone like Doug Thorley?

    Thanks
     
  2. Jul 10, 2024 at 8:09 AM
    #2
    whippersnapper02

    whippersnapper02 New Member

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    2019 4Runner TRD Offroad Premium
    It may or may not throw a code depending on the leak size and it also has to see that there is a problem.

    LT usually deletes the cats which will throw a code without a tune or some type of O2 sensor defouler.
     

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