I have a 2001 clk 430 and I went to unlock my car today and it wouldn't unlock with the keyless entry, had to use mechanical key supplied in my remote. Then I changed the batteries in my key and nothing changed.And if my problems weren't over yet, Now I put the key into the ignition and it won't let me turn the key to position one or two to start the car. After messing around for an hour I took apart the key and put it back together and the car started. When I shut it back off, it wouldn't let me start the car until I split the key in 2 and put it back together. Does it sound like the key or the IR receiver? Even with the key split and put back together I still never got back the keyless entry. The night before, everything was fine. Parked it and this is what I woke up to!!!