My Alarm has killed my Merc Currently, I am sitting here awaiting the AA to come out and make my car work. Got home, went to get in car and the keyfob had died, I swapped batteries and checked the lense in my phone camera and no beam was comming out. Went round to the passenger door and removed the plastic cover and put the key in. all hell broke loose. It now looks like a xmas tree flashing. I cant start the engine, or stop it flashing. so I called the AA. I cant use the spare cos the lense on that has gone also. How much are flip key fobs from the stealership?