Originally Posted by xnfsx
This is a great thread. Good thing you posted this. I just got 28A0 today. I took off my downpipe and everything. Do you know what causes this code? Is it just over pressure since jb4 tunes it past stock psi?
I have no idea what causes the code but you don't need to worry about it. My buddy is a BMW tech and he told me not to worry about it so I trust him. If you want email email@example.com
and he can explain to you why you get that code. Goodluck