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Old 03-28-2012, 05:15 PM
mletchworth mletchworth is offline
Join Date: Jun 2011
Location: St. Louis, MO
Posts: 4
mletchworth is on a distinguished road
OBDII Code P0420 BMW - Catalytic Converter Conversion |

OBDII Code P0430 BMW - Catalytic Converter Conversion 2 |

Yeah, doesn't seem like it would be the O2 sensors, according to those links.

How many miles on your X3? I'm not a mechanic or anything, but I'd probably start with any deferred maintenance, like spark plugs or injector cleaner. If that doesn't work, you might need a new cat.
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