1st Gen R53 Cooper S Most liked posts in thread: Fix for P0420?

  1. BlimeyCabrio

    BlimeyCabrio Oscar Goldman of MINIs
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    #2 BlimeyCabrio, Apr 26, 2015
    There are few "sure-fire" fixes for anything...

    But what usually works for this is an extender to move the downstream O2 sensor out of the exhaust flow a bit. Jan at RMW sells these.