I notice on the 4mercedes.com site that they claim to have ETA for ASR and Non-ASR. Maybe you should contact them to make sure they did not send you a ETA that is non-ASR. My E420 is non-ASR but you are having ASR issue that would make me suspect to if they swapped the correct ETA rebuilt unit on their shelf. If your ETA does not make any high-pitch noise while ignition key switch is in the #2 position, then it is not working properly. At each start-up the ETA butterfly adjust to the correct position to allow engine to start with the correct air/fuel mixture.

My suggestion is to clear all codes and try starting the engine. Sometime you will get false codes due to the orginal issue from first scan. If the problem still exist the code will occur again.