Mercedes-Benz C-Class Saloon Owner's Manual page 521

Warning/indicator lamp Possible causes/consequences and
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The red power steering system warning lamp is lit while the engine is running.
The power steering assistance or the steering itself is malfunctioning.
& WARNING Risk of accident if steering capability is impaired
Power steering system
warning lamp
If the steering does not function as intended, the vehicle's operating safety is jeopardised.
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Observe the messages on the multifunction display.
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Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do
not continue driving under any circumstances.
Consult a qualified specialist workshop.
Display messages and warning/indicator lamps 519
Solutions