to open the passenger door only from the inside – who knows the problem?

my mini-cooper, built year + purchase in 2004, now has 8 years on the hill with 39000 km drive, – I have had so far NEVER any problem, – but now: the passenger door can only be opened from the inside for some time, – from the outside there is no lock (so only to open with remote control) … if I activate the remote control, even the door button at the driver’s side opens, – not the one at the passenger’s door. in the workshop one spoke of “door covering must be removed, – d he electricity supply has to be checked” – no exact information about the costs, i.e. TEUER – a well-known person who has the same problem on another car, one called cost of approx. 250 euro! because I actually have to have the possibility to enter also on the side of the driver (been parked before, or the driver door could already be frozen) I ask first, before I even think about such a cost, HERE about whether someone has experience with it…bin for j eden Ratschlag gratifying!!! lg gabi