History and some more info on the vehicle would be nice. If your scanner is dropping out you probably have something going on with the vehicle battery and/or connections. Get the multimeter out! Or even test light if you know how to use one.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)