I have a 2011 Mercedes E350 and the magnet fuel door dose not work , how can I repare it?

Probably Fuse 38

It's not the best of charts
https://www.mercedesmedic.com/sl-class-r230-fuse-chart/

Fuses - Mercedes-Benz 2011 SL550 Roadster Operator's ...

https://www.manualslib.com > ... > Operator's manual
Mercedes-Benz 2011 SL550 Roadster Manual Online: Fuses. Introduction The electrical fuses in your vehicle serve to switch off malfunctioning power circuits.

Fuse Box Diagram Mercedes-Benz

https://fuse-box.info > Home > Mercedes-Benz
Fuse box diagram (location and assignment of electrical fuses and relay) for Mercedes-Benz CLS-Class (CLS220, CLS250, CLS350, CLS400, CLS500, CLS63) (W218/X218; ...

https://www.google.com/search?q=2011+Mercedes+SL550.+fuse+garage+door+controller

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Diagram and Videos

https://www.google.com/search?q=2011+mercedes+e350+diesel+serpentine+belt+diagram

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I suggest that you take it t a Mercedes dealer where they can simply reset the pressure monitor, probably at no cost since it's a simple operation.

you can get guide from many sites.. i know few
error codes/ fault codes, wiring diagrams, schematic diagrams, torque specs, engine info, switches functioning, assemble, disassembly, complete refurbish, repair, installation every single thing is covered
within seconds u can get the access and it's totally illustrative complete

Loose wire ?

follow link to a MB forum where you will get first hand advice from MB owners/mechanics etc
Is the easy entry exit steering wheel feature standard on 2011 E350...

I need to know the firing order of a 2011 Mercedes E350 class. Please show diagram

YOU ARE IN THE WARRANTY PERIOD STILL. BLEND DOOR ACTUATOR OR VACUUM LEAK

Look driver side under a steering wheel, could be close, small door.