Installing the ECM
WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order of removal.
The procedures to follow after connecting the new ECM are described in Guided Fault Finding and Guided Functions. Use a Vehicle Diagnostic Tester.
NOTE:
When ending Guided Fault Finding, the tester attempts to erase the Diagnostic Trouble Code (DTC) memory of all control modules. If this is not successful, the remaining DTCs stored in memory must be corrected until all DTCs can be erased.