Mercedes-Benz B-Class hatchback 2022 Owner's Manual page 506

Warning/indicator lamp
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Tyre pressure monitoring
system warning lamp lights
up
Possible causes/consequences and
* The yellow tyre pressure monitoring system warning lamp (pressure loss/malfunction) is lit.
The tyre pressure monitoring system has detected tyre pressure loss in at least one of the tyres.
& WARNING Risk of an accident due to insufficient tyre pressure
The tyres can burst.
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The tyres can wear excessively and/or unevenly.
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The driving characteristics as well as the steering and braking may be greatly impaired.
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You could then lose control of the vehicle.
Observe the recommended tyre pressures.
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Adjust the tyre pressure if necessary.
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Stop the vehicle in accordance with the traffic conditions.
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Check the tyre pressure and the tyres.
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Solutions
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Display messages and warning/indicator lamps 503