05 X5 is prompting me for a code and won't start, can anyone help me figure out how to get this 4 digit code? Do I need to bring it to a dealer?



Im almost giving up hope on my car. I just replaced my cracked coolant reservoir after waiting for the tank for a week. once I got done, i followed the instructions from here to turn to 'on' but not start car, heater at 90.

However, this killed the battery. So I bought a battery tender, since i kept reading how risky it is to jump the car. Now battery if fully charged BUT IT WONT RECOGNIZE THE KEY/WONT START AND IS PROMPTING ME TO ENTER A CODE!

Can someone tell me how I find this four digit code? Do I have to bring it to a dealer, cuz that would really demolish my soul. Just two days before my tank cracked, I had to bring it in for busted oil sensor and vacuum pump. Its just one after another right now, hard for me not to freak out.