Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 580

578 Display messages and warning/indicator lamps
Warning/indicator lamp
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Power steering warning
lamp (yellow)
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Power steering warning
lamp (red)
Possible causes/consequences and
Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving.
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Uncouple the trailer and secure it against rolling away.
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Initiate a new swivel movement and do not re-couple the trailer until the warning/indicator lamp goes out.
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Note the messages on the driver display.
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If the trailer hitch is swivelling:
Wait until the ball neck has reached the operational position.
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* The yellow power steering warning lamp is lit when the engine is running.
The power assistance or the steering itself is malfunctioning.
Note the messages on the driver display.
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* The red power steering warning lamp is lit while the engine is running.
The power assistance or the steering itself is malfunctioning.
& WARNING Risk of accident if steering capability is impaired
If the steering does not function as intended, the vehicle's operating safety is jeopardised.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not
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continue driving under any circumstances.
Solutions
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P223 0288 02