Clearly many, many parts are being made still for our E53s, and others are not. As of this past Wednesday I'm sporting a cool Trifecta of lights and have been researching causes and fixes. Thankfully there is lots of great info on this, and other sites. Much of what it could be is very much available new, but it doesn't seem that the DSC module and compressor are being manufactured any longer. I've managed to find a few in stock, but they are crazy money now.

it seems strange to me that so many parts on our cars have multiple manufacturers, but a few don't seem to be supported at all any longer. Fortunately, if I'm lucky enough it will be a wheel speed sensor, or steering angle sensor, both of are still made by several mfrs.

That said, it is a pretty standard Bosch DSC unit from that era and I wonder if I can get the same model from audi, porsche, etc. and flash it. Assuming someone still mfrs these things.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee