Sounds stupid but I find too much muck on the sensors causes your problem. A clean up often solves it.
BUT I was here for the Tyre pressure warning. Gone off three times in the last week but a pressure check shows no problems. Any clues on this would be helpful.

Thanks for responding. I have a E53 late 2006 3.0d sports, purchased 2 years ago with few problems. It is used mainly for caravan towing and copes really well without any alteration to fan or oil cooler. Will put pics on shortly.

Off to France at end of month so decided to check the beam converters. Left side, not a problem. Right side - as soon as I touched the lever, it sprang upwards and out of sight/feel. Can anyone tell me whether I wii need to get into the xenon housing to retrieve it and if so, can I do it myself? Or ...