2006 BMW X5 4x4 light on for no reason

Most likely no big deal. Happens al the time on BMWs. Most likely the steering angle needs to be reset because of some crazy stuff electrical gremlins that cause it to lose it's position or memory of the steering. Just start the car and turn your steering wheel all the way to one side until it stops and can't go any further then you do the same only this time going the to the other side. You do this a few times and the light will go out as the computer now has reset the steering angle and it now nows where center is by calculating the travel difference of the two furthest extremes the steering can travel.

Is this a fix for the 4x4 icon because i replaced tge plastic gear inside the transfer case actuator and light is still on

It's one of the fix. There're many reasons and faults that cause the 4x4 light to come on. The plastic gear problem is one that you'd mention. The light will stay on even after the fix until you clear the code with a scan tool. After that the light should stay off. If it comes back then the problem was something else.

Steering angle sensor - Replacement Expensive parts

Hello I just buy my 2006 BMW X5 4.4i thé power switch door lock not working I put a new one since then all the door are lock key switch not working . Can anyone please help me with some new advice

Sometimes its plastic gear in actuator motor for 4x4 and sometimes its uneven tire pressure in each tires. One time came on when I had rear tire at 26 mid and the other rear tire at 30 so I filled air at 35 psi for all tires at gas station then light was removed forever.

Have a 2015 BMW X5 it will crank and shut off a light comes on about the 4 4 what could be wrong