A couple of times now, and only when I have the lights on at night, my 4x4 light, abs, and a couple of other lights come on and the transmission goes into limp home mode. Last night the light came on to check low beam headlights but when I checked they were ok. In the daytime there is no problem. I dont know if the battery is on the way out or what could be causing this to happen. Any suggestions would be greatly appreciated. Thanks guys.

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2004 X5 4.4i Sport Black with 20 inch staggered wheels. 80000 kms