Not exactly a gas in the take issue, but a big part of the high Sprint repair costs is the Mercedes policy of replace everything rather than do any actual repairs.
I had mud-daubers build a nest around the turbo inlet valve motor actuator linkage, which on my 2010 2500 6 cyl 3.0 is tucked way back there against the firewall and hard to see without a mirror. Mercedes wanted to replace the entire actuator motor assembly to the tune of nearly $2000 parts/labor. Now that I knew why the turbo was not boosting and where the actuator was, I paid the diagnosis charge, drove home, a little slow on acceleration since I was without turbo boost, got the hose out and washed the dauber nest away.
Been working just fine since.
A little education and an application of common sense saved me over $1500!
Sigh, one day my Sprinter will be old enough that Mercedes will license the codes and expand 'authorized repair' beyond the dealerships so the good old fashioned work-a-day shops will be able to take care of stuff like this at a reasonable price.