P1686 control module faulty programming

[A4b7guy]

Audi a4 b7 2.0tdi brd Any one had the error and found the problem be getting this fault on a daily basis driving along normally car will feel like it cuts out for a split second revs drop and then cokes back to life with the coil light flashing for about 10 seconds then goes away car drives fine after anyone know or had the issue 

[Steve Q]

Besides the diagnostic check what have you done? 

Sounds like the module needs replacing