Mercedes-Benz Vito engine fault code P0101 P0171 P0299 4K

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Mercedes-Benz
Vito
2.1 114 BlueTEC
Change vehicle
Engine code: 651.950
(447) (14-)
100 kW (136hp) 3800 rpm
(2015-2016)
P0101-FB Mass air flow sensor 1 has a malfunction. - Pending, Stored
P0171-00 The mixture (cylinder bank 1) is too lean. There is a general failure. - Stored
P0299-FA The Boost pressure of turbocharger 1 is too low. - Pending, stored

[@Annoyingirl221]

Brilliant video

[@aroxh4919]

Can the Cooler also hint into a P0101 Issue code?

[@brittenv1000]

How to remove bumper?