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Originally Posted by sleepless
I think this might not be the case.... someone told me that the X5 for US uses the sensors in the wheel instead of ABS system ???????????/
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It counts the # of revolutions the wheels make and compares them. The one turning the fastest has the least air (smallest diameter) and could be going flat causing it to alert. All BMWs equipped with Ibus work this way.
Your SA is an idiot (mostly the case with every SA though, although there are some good ones) and you should seriously reconsider anything he tells you in the future.
CCC (E60 5, E90/2 3, E63/5/6 6&7) cars might use air pressure sensors, but Ibus (E53 X5, E39 5, E38 7) and K-Bus (E46 3) cars use the ABS sensors to give a flat tire warning.