My 2014 E250 W212 Keyless-Go stopped working today so it neither allows keyless door entry nor the engine to start. The FOB (which now has a new 2025 battery) does lock and unlock the car and of course after inserting, allows the car to start. I read elsewhere that this could be a fuse failure but I cannot identify the relevant fuse or find any that are blown. There are other symptoms which are that the car cannot be locked using the tailgate lock button. Hope someone can help me fix this without having my local MB dealer ask for £148 to run a diagnostic check.