I feel your pain. I too am having electrical issues. And I'm going to change my ignition switch. I've done the battery reset thing and installed a brand new high quality battery. That made no difference so it's on to the switch. It's only $50 to buy a new one and looking in the Bentley manual it seems a straight forward job to do myself.

It's worth a try.

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2001 X5 4.4i