Man what a small world...I just had a tow in with 111,000 miles with the exact same problem. Though this is not the first time I have seen this it is the lowest miles I have seen the failure.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM