thanks, Junky. Yes, my electrical system is fine; I'll take it back to my earlier shop [that finished up my front suspension work, just before the DSC/4x4 light appeared] to have then run the codes on DIS/GT1. If it comes to it, I'll replace the yaw sensor, but the multiple warnings I see about replacing the steering sensor not being a DIY job [and requiring coding before you even drive it!] make me reluctant to jump in there. I don't perceive any performance issues; given the code, I'm thinking its not the yaw sensor, either, just a finicky bavarian electrical glitch that the computers should sort out. Same with the codes thrown for the transfer case [fluid just changed], with the shop thinking the 5F3A being the actuator gear I replaced 60k miles ago. I'll listen for the click and replace it again if necessary.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.