[Rubenz08]

I hv a issue when i go in to my f10 2011 and close the door the key not detected warning just pop up in screen but it just take a couple second and gone
Its happen every time i got in to my car
But i can still normally start engine as usual

Its that mean my key is lowbatt and must change my battery?

Please give me advice
Thanks a lot

 

[Trian]

That is the easiest and cheapest fix to try first. Batteries do wear out.