New batteries would be drained within a couple days. Gas gauge would bounce around while driving, sometimes wouldn't work at all. Speed gauge will not work intermittently.

Navigation screen would cycle turning off and on while driving.

Dealership reports they had their "electrical expert" working on the vehicle, took them 3 weeks to give us any info about possible causes. Don't know if it be cost effective to have other shops do more diagnostics if the dealership had the vehicle for so long trying to determine the cause

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2000 E53 4.4
2011 E70 35d