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Up to 2003 there was no discussion of coding. My 2003 was fine without. Starting with the LCI in 2004 there were some vehicles that required it, but not all. It appears to depend on the combination of options and software configuration of each vehicle. The coding doesn't load any programming, it simply tells the vehicle that the trailer wiring module is now there, and so to use it.
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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
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