I have a Passat diesel with EGR deleted, and it has a cat. I got it plugged up on small portable device that read out codes, and it said my egr valve is the mean problem.
It is the next step in the restoration of shopping for auto parts. The days of high too much for auto parts are over. You will find thousands at partsgeek.
Driving a couple of days ago the coil icon came on in the instruments with a message of an engine problem suggesting it go to the workshop.
Buying review Mercedes-Benz E-class (W212) 2009-2016 Common Issues Engines Inspection