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Old 01-15-2012, 02:40 PM
Etubom Etubom is offline
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Location: Niagara=on-the-Lake, Ontario, Canada
Join Date: Mar 2006
Posts: 20
Mein Auto: 2004 X3
I had the same problem with my 2004 X3.

Hesitation occured when under hard acceleration between 2800-3000 rpm. Would not throw a code for a long time, but finally did so 7 months ago. The problem was with one of the pre-catalytic converter O2 sensors. It was replaced, the problem disappeared and the X3 has been smooth as silk ever since.
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