Bmw low battery key fob problem solved! 

House and Car Hacks channel has a brilliant video covering these issues with a unique solution

Go by the 10.12.14 Battery Multi meter Guide. If on start your battery falls below 10V your battery may be dead (Start the engine with multi meter and check). If static ( your battery should be showing 12.0+ or - thereabouts 12.10v is ok). when started it should show 12.7 and above (max 14.5) because of the alternator charging the battery and powering the lights, ancillaries etc, air con etc. Just a rule of thumb before you throw a good battery away. Hope this helps.

Great video! My Mercedes has the same issue and problem solved!!!

My car did the same thing but it wasn't battery. It was the steering lock. Just shift your steering to the left or right and start.

I had same problem. Changing the battery. The triangle still pop up. Then I ask the workshop to reset the bmw. And it's gone.....

can this issue make the car not to start

I’ve disconnected the battery then after connecting thé message disappeared and it worked with my second key. I dont know why but with my first key and new battery it does not work at all. Whereas with my second key and existing battery it works. Battery voltage of the new is above 3v around 3.2v dont know if this is the reason.

Wow! That's great! I've been having the same problem! It's been driving me crazy! Thank you for sharing this!

How long did the new battery last ?

Not helpful for my car. I have a 740

Hi i bought battery and problem still there door stucked on the lock

Did this solve it for long time or did your message come back

Did you code or learn your new battery after placing the new battery?

I had the same issue and my car battery was almost *brand new* so obviously I didn't change it. So I drove the car on a highway for around 45 minutes then stopped, removed the key then re-insert the key and the message was gone from the display. The error will still be stored in your car's *internal memory* though, BUT that can be deleted with Carly on INPA, etc.

Definitely you got a old bmw

You should have tried hooking up the old battery. Disconnecting the car battery can reset codes and might have been the issue.