Good evening, I'm new to this forum. I have got a UK 2006 BMW X5 E53 3.0d automatic. i have own the car for 2 years. Every summer that i own it, i took it on holiday. Last year before i set of for the holiday i did a general engine service(engine oil filter, engine oil, air filter, pollen filter and front left lower control arm). After I had the garage to check for any codes. I set of for the 1500miles journey for my home country. The car performed well(drive able)but I noticed after I changed the pollen filter there were no heat coming through the vents when turning the wheel to 3 red heat dots with the motor warmed up. 2 weeks in the holiday when i was taking sharp corners on normal driving speed the 4x4 warning light comes on and would cut out the accelerate. if i don't take my foot completely off the accelerater the car wouldn't accelerate. After calling a friend that is a mechanic back in the uk, he said I should of done a wheels alignments /tracking. I went to a modern tracking garage. They found out my wheels alingments was off on the front but ok on the rears. After doing the wheel alignment. The 4x4 amber warning light still comes on if I turn on a sharp bumpy corner or the steering wheel quick right to left, left to right the light still comes on. After 6months I still have the same 4x4 light problem but it would light up if the car is not jerked left to right or right to left and on level ground. If in a corner is uneven the light comes on. I searched some forums but the symptoms weren't like mine. I don't know if their are any sensors faulty and sending false data.