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Thread: 29F4 29F5 / P0420 P0430 for 335i

  1. #1
    Join Date
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    29F4 29F5 / P0420 P0430 for 335i

    2009 bmw 335i sedan w/ MT and ~140k miles

    Situation:
    car drives horribly (rough acceleration and poor power delivery) and currently have SES / CEL on
    used my bavarian technic cable to find the following problems:
    IMG_9890.jpg

    used my cobb ap to find the following codes:
    IMG_9895.jpgIMG_9896.jpgIMG_9897.jpgIMG_9898.jpg

    QUESTIONS:
    1. are these codes indicating issues with the primary cats in the downpipes or the secondary cats or both ?
    2. do i need to replace any or all of the o2 sensors as well ?

    I decided to go catless downpipes rather than going back to stock - want to get all the parts i need first and understand what i need to do

    i can use my cobb AP to flash my car to pass emissions (hopefully) but i am trying to figure out if i need to do the o2 sensors in addition to removing my current stock downpipes w/ the bad cats

    my car runs atrocious b/c of this and also primarily b/c it's got 140k and has NEVER been walnut blasted - that's on my to do list as soon as all the tools for the job get to me

    Any input ?
    Thanks!
    Last edited by juicehound`; 04-14-2018 at 02:00 PM. Reason: make it more clear

  2. #2
    Join Date
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    Nothing ATM
    Attachment 627002

    this is the other pic from my bavarian tech cable - i couldn't' fit it in the first post
    Last edited by juicehound`; 04-14-2018 at 02:19 PM.

  3. #3
    Join Date
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    Those codes are for the primary cats in the downpipes. I'm not even sure if these cars have secondary cats. They may just be resonators in the exhaust pipes.
    ASE and BMW Master Certified Technician

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