lilolme

I have a 02 C240. Last night after driving, I noticed the key fob wouldn't lock my doors. This being nothing new because the key fob is old, i didn't think anything of it. I got in to drive today and it wouldn't start. It cranks automatically like it wants to, but never turns over. Then I noticed a malfunction, "display faulty visit workshop." Im not sure what this could be. My key? I read somewhere about a rear SAM. I have no clue what to do or to think.. Im sucha girl, sheesh... can someone possibly lead me in the right direction. ? Im sure it will be costly but i don't have allot of mullah to spend... its the holidays *bah hummbug*