New Member..Exhaust system question.

Discussion in 'Just registered? Post here to introduce yourself!' started by mray, Nov 16, 2019.

  1. mray

    mray 06 Liberty 3.7L

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    I installed the MBRP cat back exhaust kit. Everything is great. But the check engine light came on code p0403 I think the code is. I had it checked . The technician said the exhaust is too free flowing and the rear O/2 sensors are not reading the exhaust gasses correctly. Anyone ever had this problem.
     
  2. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    P0403 is the EGR Solenoid Circuit, ahh...that does sound right, can you get the code read again?
    My guess, you may have to move the rear 02 sensors? Tom may know more..
     
  3. mray

    mray 06 Liberty 3.7L

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    p0430...transposed the number. rear o/2 sensor issue. It has a new converter and all 4 o/2 sensors have been replaced. I am thinking the exhaust is too free-flowing and not allowing the rear sensors to read the exhaust gasses. Too Bad.. I like the extra power.
     
  4. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    What brand of 02 sensors did you use?
    NTK 02 sensors are the only choice I would recommend.
     
  5. mray

    mray 06 Liberty 3.7L

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    I believe that was the brand. Everything was OK until I installed the cat back exhaust. I really do not want to put a stock muffler back on just to remedy that problem. Is this a common problem you have heard of?
     
  6. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    I just did a search, on cat back exhaust etc + MBRP not viewing any complaints on 02 issues hmmm..
    Can you confirm for sure NTK 02 sensors are in there?
    Tom will know more ..hang in there..
     
  7. mray

    mray 06 Liberty 3.7L

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    PART#23159 OXY.. I think that is NTK part#. It was a plug n play type . Not universal splice type.
     
  8. mray

    mray 06 Liberty 3.7L

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    SORRY.. New to the website. I did not mean to stutter.
     
  9. tommudd

    tommudd Moderator Staff Member Moderator

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    I'm running the MBRP cat back on the 03 now, no issues at all here, yes somewhat more free flowing I would say, but you have another issue

    Plus ran a free flow on my 04 for 220,000 miles, no issues there either
     
    Last edited: Nov 16, 2019