Mercedes-Benz CLA Owner's Manual page 570

Display messages
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Tyre press. monitor inoper-
ative No wheel sensors
h
Wheel sensor(s) missing
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Check tyre(s)
Possible causes/consequences and
* The wheels fitted do not have suitable tyre pressure sensors. The tyre pressure monitoring system is deactivated.
Fit wheels with suitable tyre pressure sensors.
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* There is no signal from the tyre pressure sensor of one or more wheels. The pressure of the affected tyre is not
displayed.
Have the faulty tyre pressure sensor replaced at a qualified specialist workshop.
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* The tyre pressure in one or more tyres has dropped significantly. The wheel position is displayed.
& WARNING Risk of an accident due to insufficient tyre pressure
Tyres with insufficient tyre pressure pose the following risks:
The tyres may burst, especially as the load and vehicle speed increase.
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The tyres may wear excessively and/or unevenly, which may greatly impair tyre traction.
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‑ The driving characteristics, 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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Display messages and warning/indicator lamps 567
M M Solutions