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Thread: P0420 Code Won't Clear After Cat Sim

  1. #1
    Join Date
    Jun 2018
    Location
    Toronto, ON Canada
    Posts
    2
    My Cars
    2011 BMW135

    P0420 Code Won't Clear After Cat Sim

    Hey All,

    I recently installed the AREA74 02 sim on my PWG N55 w/JB4 but can't get the P0420 cat efficiency code to reset after more than 100km of driving. Wiring has been checked over multiple times according to the DIY. Additionally, the CEL is not coming on, which it normally would after several trips on MAP 0, and which makes me think that the device is actually doing something....but that damn code just won't disappear. Any thoughts?

  2. #2
    Join Date
    Jun 2018
    Location
    Toronto, ON Canada
    Posts
    2
    My Cars
    2011 BMW135
    Was able to solve this one myself. FYI for anyone in a similar situation, switching to MAP 0 isn't enough, you also have to make sure that auto-clear is turned-off (which MAP 0 doesn't automatically do). Speedo 10 Tach 4000 to shut-off auto-clear.

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