In 1988, I drove my 323i to Scotland to take a new job there and had an overheating problem on the way. Dealer in Aberdeen claimed the radiator was SURE to be the problem..... They replaced it. I picked it up and within 5 miles the car overheated! Drove it straight back and they removed the new radiator, handed me my money back. Needless to say I was very unhappy. Took it home, found a specialist who assured me the head was cracked. I took the head off, had it welded, stress relieved and planed. Never overheated again :-). So, that was over 30 years back and much closer to Germany, taught me to fear all dealers.

A CAS may have to be programmed from the factory due to it being part of the security system on the vehicle but I'm not sure.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.