This could have been an isolated experience. If not, you will know soon.
If this happens again, get out and lock and unlock the doors a couple of times. This will reset the Anti-theft alarm if it is acting up.
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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope

1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM