Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi, this sounds more like a restricted catalytic converter for cylinders 4, 5 and 6.
I'd perform a converter back pressure test or just loosen the converter and road test the car and see if that solves the problem.
If it were a maf or O2 sensor you would have fuel trim codes or oxygen sensor codes.
Your symptoms are typical of a plugged converter.
Let me know if you have any questions or if you need more help with it.
And please remember to click Accept so I receive credit for my help.