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Thread: P0420 & P0430 pending

  1. #1
    Join Date
    Jun 2017
    Location
    Denver, CO
    Posts
    442
    My Cars
    '08 E90 335xi manual

    P0420 & P0430 pending

    '07 335xi N54 E90 auto, bone stock, 93K miles. No CEL, but I pulled codes yesterday and found P0420 and P0430 pending. In no hurry to spend $1700 on downpipes; does anyone have a proper diagnostic procedure to make sure the cats are the problem here? Ways to eliminate the O2 sensors and other factors?
    And I hesitate to ask, but has anyone tried Cataclean?
    Thanks!

  2. #2
    Join Date
    Sep 2018
    Location
    usa
    Posts
    5
    My Cars
    bmw 328xi 2008
    did you figure out what's the problem

  3. #3
    Join Date
    Sep 2018
    Location
    usa
    Posts
    5
    My Cars
    bmw 328xi 2008
    ????

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