I have a 240e which has not been used for 3 months. I cannot open the door with the fob or the emergency key. The fob has new batteries and the car battery is 12 months old.
Hello,The battery can self-discharge in 3 months of winter. If the vehicle is stored, battery should be charged every two months.
To get inside, you can try to use WD40 or de-icer to make the door locks work.
Another possibility is to pull the inside door handle with a suitable wire through a crack between the door and body
then the bonnet can be opened and battery charger connected.