If it was me I would be taking that bumper cover off and looking for hack repairs of the systems in the front end of the vehicle.

Also I would be scanning the system with Xentry and make sure that there are no codes related to malfunctioning systems. In this model the events that are captured by the system are astounding. Burnt out light bulbs get recorded in the history.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech