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Old 08-21-2012, 08:02 PM
Want the Thrill Want the Thrill is offline
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Location: Michigan
Join Date: Sep 2009
Posts: 1,041
Mein Auto: 2011 X3 35i
The TSB is 12-04-12. Here is what it reads:

N55: Idle Fluctuates Briefly After a Cold Engine Start
E70, E71 with the N55 engine from 4/2010 (SOP) to 10/2011
F07 with the N55 engine from 3/2010 (SOP) to 12/2011
F10, F12, and F13 with the N55 engine from 3/2010 (SOP) to 12/2011
F25 with the N55 engine from 7/2010 (SOP) to 12/2011
Under certain engine cold starts, the engine idle may fluctuate during the first 10-20 seconds of operation before
becoming stable.
No faults will be stored in this situation, which will usually only occur at specific engine temperatures, making
it difficult to reproduce in the workshop.
Unfavorable DME software calibration
Program the vehicle using the most current version of ISTA/P.
The corrected DME calibration was introduced as listed below:
E70, E71 N55 E070-11-09-505
F07 N55 F001-11-09-507
F10, F12, F13 N55 F010-11-09-507
F25 N55 F025-11-09-507
Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the
latest software.
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