Observe use-by date on the sealant container.
Compressor
BMW X3 Owners Manual > Tire Pressure Monitor TPM: Required tire inflation pressure check
message
A Check Control message is displayed in the
following situations
The system has detected a wheel change,
but no reset was done.
Inflation was not carried out according to
specifications.
The tire inflation pressure has fallen below
the level of the last confirmation.
In this case:
...