Mercedes-Benz C-Class Saloon Owner's Manual page 525

Tyres
Warning/indicator lamp
Possible causes/consequences and
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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
Tyre pressure monitoring
system warning lamp lights
Tyres with insufficient tyre pressure pose the following risks:
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You could then lose control of the vehicle.
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The tyres may burst, especially as the load and vehicle speed increase.
The tyres may wear excessively and/or unevenly, which may greatly impair tyre traction.
‑ The driving characteristics, steering and braking may be greatly impaired.
Observe the recommended tyre pressures.
Adjust the tyre pressure if necessary.
Stop the vehicle, paying attention to road and traffic conditions.
Check the tyre pressure and the tyres.
Display messages and warning/indicator lamps 523
M M Solutions