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I also have an 2009 X6 5.0 with a check engine light that comes on repeatedly. My problem, according to the dealer, is the battery being weak. The sequence starts with the check engine light, a few days later it is the date and time are lost, then other symptoms like losing the memory on the one touch buttons. They blame me for not driving enough at highway speeds. I have had the car for 13 months and have driven about 6,000 miles. This has happened about 5 times. The fix: hook the car to a charger overnight. A few times the check engine light as later gone out. I am frustrated that my loaded X6 5.0 is the "wrong car for me" because I live close to work and shopping.
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