Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 494

Display messages
C
M
N
Possible causes/consequences and
If the display message appears regularly, contact a qualified specialist workshop.
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* At least one door is open.
Close all doors.
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* The bonnet is open.
& WARNING Risk of accident due to driving with the bonnet unlocked
The bonnet may open and block your view.
Never release the bonnet when driving.
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Before every trip, ensure that the engine bonnet is locked.
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Stop the vehicle immediately in accordance with the traffic conditions.
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Close the bonnet.
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* The boot lid is open.
& DANGER Risk of exhaust gas poisoning
Combustion engines emit poisonous exhaust gases such as carbon monoxide. Exhaust gases can enter the vehicle
interior if the boot lid is open when the engine is running, especially if the vehicle is in motion.
Always switch off the engine before opening the boot lid.
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Solutions
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Display messages and warning/indicator lamps 491