Exhaust wiring C207

[supermonkeyman]

Hi guys, I kept getting EML and reduced power, apparently it was something to do with some exhaust wiring, some part of the loom was replaced whilst some was repaired, this was covered by MB as my car is out of warranty which I thought was very nice of them, any idea what could've caused this?

I asked the dealership but they weren't sure, didn't really get any more info out of them.

My car is a 2011 E250 diesel btw