What are the reasons why the BMW X3 door lock cannot be opened?

[VanMicah]

BMW X3 door lock cannot be opened for the following reasons: Remote control failure: Unresponsive buttons, low battery, environmental factors, strong signal interference or shielding, anti-theft system malfunction, or the need for remote control re-encryption and matching can all lead to remote control failure. You can try using a spare remote key to make an accurate fault diagnosis. Cold weather preventing door opening in winter: In northern regions, winter temperatures are extremely low, often below freezing. Residual water from car washing can accumulate in door handles, locks, and door frame gaps, freezing overnight and firmly sealing the door shut, making it impossible to open in the morning. In such cases, avoid using brute force to yank the door open. The most effective solution is to pour warm water over the frozen door area to melt the ice quickly or wait until midday when the sun raises the temperature sufficiently to open the door. Fault in the door lock mechanism itself: The likelihood of the door lock mechanism itself failing is very low and mostly occurs in older vehicles.