06 Diesel, 450. Took it out on Sunday noon, ran just fine. Wanted to go for a drive Sunday evening, nothing. Ignition turns on, key symbol flashes nonstop, not just 9 times. Put new battery in the key, but nothing. Also does not lock or unlock doors. Does this mean I have to take it to Mercedes and get the key reprogrammed, or is there a reasonably priced OBD2 reader that I can buy and program the key myself. Thanks for any help on this topic