So I have an issue with my 2004 a6 2.7 S-line. I recently had to replace my transmission. The old one went bad and threw about 7 diff codes. I've tried with my vag-com to clear the codes and it will not let me. It starts to and the says lost communication. when I pulled the engine and trans the battery was unhooked for a week and it still didn't reset the tcm. Anyone help?