Mercedes-Benz E-Class Saloon Owner's Manual page 561

Warning/indicator lamp Possible causes/consequences and
You could then lose control of the vehicle.
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Stop the vehicle, paying attention to road and traffic conditions.
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Check the tyre pressure and the tyres.
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The yellow tyre pressure monitoring system warning lamp (pressure loss/malfunction) flashes for approximately one
minute and then remains lit.
The tyre pressure monitoring system is faulty.
Tyre pressure monitoring
& WARNING There is a risk of an accident if the tyre pressure monitoring system is malfunctioning
system warning lamp
flashes
If the tyre pressure monitoring system is malfunctioning, it is not able to issue a warning if there is pressure loss in
one or more of the tyres.
Tyres with insufficient tyre pressure may, for example, affect the vehicle's handling characteristics, steering and
braking. ‑
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Consult a qualified specialist workshop.
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Observe the recommended tyre pressures.
Adjust the tyre pressure if necessary.
Have the tyre pressure monitoring system checked at a qualified specialist workshop.
Display messages and warning/indicator lamps 559
Solutions