well i have a 97 4 dooor civic which i picked up 2 motnhs ago i love it a/c blows has tints chill car but its starting to have a coupe minor promblems

1.the key doesnt want to come out unless i diconnect the battery

2.the brake lights wont turn off unless i disconncet the battery

3.and the fuel guage thing is always on full

can anybody please tell me whats wrong with my car ???