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2G P0141 but there is no sensor connected

Posted by 609DSM, Apr 7, 2020

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  1. 609DSM

    609DSM Proven Member

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    Langhorne, Pennsylvania
    So she has a 6 bolt swapped in and is straight piped with an aftermarket boost gauge and that's it for mods.

    Was it pure laziness that I dont have a bung or even a bank 1 sensor 2 O2 sensor? Is there a reason for not running one? If anyone could shed some light it would be much appreciated!
     

    Street Build 221  2

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 344  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  2. Bleakley

    Bleakley Proven Member

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    Joined Jan 29, 2017
    Pittsburgh, Pennsylvania
    Sensor 2 is after cat and is 99.5% for emissions / keeping converter efficient.
    The weight on the system is VERY small.
    PCM has noticed open circuit voltage and has flug the code.
    No worries man.
     

    Street Build 1K  1

    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM
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  3. 609DSM

    609DSM Proven Member

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    Langhorne, Pennsylvania
    Cat has been deleted, didnt specify when has said straight piped. Its all crappy welds, plan on replacing the cat back and throwing a cat on the car so I can get passed emissions.

    Although when I look at my fuel trims they are very lean, is this because there is only one O2 sensor. The exhaust manifold is cracked and it revs up and down on a cold start. Not entirely sure there is a vacc leak but it's a high possibility. Also havent seen it ever go into boost even when free revving up to 4k rpm (have been fairly gentle with her)
    Thanks for the quick response!
     

    Street Build 221  2

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 344  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  4. Bleakley

    Bleakley Proven Member

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    Pittsburgh, Pennsylvania
    Missing rear o2 will not cause lean fuel trims.
    Even moreso since the sensor is gone and the PCM knows it.

    Def take care of the exhaust issues.
     

    Street Build 1K  1

    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM
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  5. Mello

    Mello Proven Member

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    Albuquerque, New Mexico
    You'll have best luck passing emission when all the mechanical stuff is fixed & working. A cracked exhaust manifold will let outside air into the exhaust gases and can cause a false lean conditions. You should replace or fix the the manifold which will give more accurate O2 values. Turbos don't build boost free revving, boost build when the motor is under a load. The O2 after the cat does not effect performance, it's only to monitor the cat & check that it is in good condition for emissions.
     
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  6. 609DSM

    609DSM Proven Member

    325
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    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    Thanks for the clarification! Havent taken it on the road due to the maintenance is very lacking at the moment. I'll get everything fixed and then see how it's running then.
     

    Street Build 221  2

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 344  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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