I have a lot of different codes popping up on my

Head Gasket Failure or some reason to
dump coolant when hot, out the exhaust

Black smoke is a sign of engine overload, a restricted air supply, or a malfunctioning injector. For some reason, excess unburned fuel is being blown out of the exhaust.

HI SOUNDS LIKE YOU GOT AN OIL LEAK ON YOUR ENGINE THATS WHY YOU HAVE SMOKE COMING OUT THE RADIATOR GRILLS SOUNDS LIKE A GASKIT NEEDS REPLACED GET A MECHANIC TO HAVE A LOOK

Hi
A few things you could look at that would contribute to your X5 stalling would be:
1. Air Filter
2.Fuel Filter
3.Mas air flow sensor and associated pipework (leaks/ come addrift)
4.Vaccumm leaks (pipes and engine)
5.Spark plugs (lots of pictures on-line of different types of build up/fouling on them and fixes)
7.o2 sensor located on the exhaust
6.Failing all the above the fault can be read at most garages by a fault reader and that should if not defiantly point the fault out.

Have a go at the Positive Crankcase Valve (PCV). its located under the engine cover towards the rear of the engine in an odd shaped black plastic box alongside the fuel injectors, Dont pay BMW the Big dollars. Buy a filter for $50 AuD on Ebay or the whole unit for $120 AuD. You have to remove the engine covers to do it but thats not so hard really, just a bit involved and takes 10 mins to remove the engine cover. The actual filter is a throw away job, but the whole PCV assembly is just a degrease and clean. Its held in place by four small hex headed bolts, when you lift it you'll find the small can shaped filter pinned underneath. Swap the filter. its VERY unlikely to be your turbo at 41,000m.
The PCV is a known issue that causes smoking and even power loss, BMW actually did a retrofit kit PCV for use in cold climates., Are you in somewhere cold? and another possibility is not using the correct 'Winter diesel' in a cold spot. Very common fault for X5 owners going up to Thredbo or Perisher snowfields in Australia for the first time!
Happy Motoring

Just had my car in the garage with horrendous white smoke coming from the exhaust. The problem with mine was a blocked crankcase breather. When blocked oil is passed into the exhaust system apparently.
Problem solved by the mechanic and half a day in the garage with the engine running to burn off the excess oil in the exhaust and the problem was solved. Had gentle ride out to the coast yesterday approx 1.5 hrs each way and the smoke has gone.
Good result for £160.00. I dread to think what the dealer would have charged.

The air/con ducts can get a buildup of '****' in them.The dealer will charge a lot to fix this.Get some Glen 20(anti-bacterial spray) and with the vents in recirculating cycle,spray it in the inlet vents under the dash in the footwell area.Also get a spray called odour-off.Use this also.For about 10 dollars you can fix the problem.It works.The smoke coming out is usually condensation mist and nothing to worry about.Hope this helps

RINGS AROUN THE PISTON, OIL LEAKING INTO THE COMBUSTION CHAMBER

sounds like its water vapour!
could be a head gasket starting to fail or the head is warping!

I'm sorry to say this, but it sounds as if your turbo is shot.