Hey guys, I have a big problem. My BMX X3 E83 2.0D 2005. Has error codes. 5f39 - Transfer Case: Internal. 5f3a - Invalid function of transmission case. 54c8 - Classification impedance. 5463 - Mechanism failure. 5462 - Servo motor or coupling force too high. When I did Google, all the codes lead to the plastic gearbox I replaced last week, but it still wasn't broken. The brake pressure sensor is working properly. Any ideas what it could be ??? thanks if anyone can help ...