BMW E89 replace EPS, fault code D507

Customer came, complaining no power steering and speedometer have error message. after diagnose found fault code
D507 which mean EPS controller unable to communicate with the rest of the component in PT-CAN system. advised replace EPS, unfortunately you couldn't change EPS alone BMW don't sell separately maybe someday they will :P, complete steering rack is necessary. After replace adaptation are require. 
 
宝马E89動力轉向不能运作，仪表显示有故障在診斷过后得出是 
"D507 EPS" (EPS = 電動助力轉向), 无法和PT-CAN 系统沟通，

也就是说要更新EPS，问题宝马没有单卖这个零部件，
 要整个轉向架更新。