Well said by ovekam and XavVD....it is not a tyre pressure system per se. It is idirect, so you need at least one wheel to have the ''original'' pressure so it can be compared with the pressure in the other wheels.
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2011- : BMW 116i (F20)
2009-11: BMW Z4 2.5si (E85)
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2005-07: BMW 325ti (E46)
2004-05: BMW 318i (E36)
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