Hi I had P1606 code on 2000 Audi A6 2.7T Automatic. The code was something about electrical mulfunction between ECU and ABS. Module master rebuild the module and now abs kicks in, but the code is still in the system when i scan it and when i erase it,it comes back.

 

Erase it and right away disconnect the battery. Leave it over night and see if maybe that works. Or just disconnect the ECU's power supply after you erase the codes and leave it disconnect until the next morning.

Did you really need three threads for the same thing?