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It is the catalytic converters. The rotten egg smell (sulphur) comes from unburnt fuel in the converters. It can be from overfueling, or from a failing catalytic converter. The eventual failure mode is likely to be plugging.
I would get the converters checked. Whatever the warranty period, emissions components have different warranty terms (a federal requirement). Take it to a dealer.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Last edited by JCL; 03-12-2006 at 08:42 PM.
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