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What are the reasons for Mercedes-Benz displaying a protection system malfunction?

2 Answers

KiraMarie

07/24/25 3:04am

Mercedes-Benz displaying a protection system malfunction may be caused by a damaged airbag, anti-towing issues, a depleted car battery, or flooded spark plugs. Solutions: Try turning off the anti-towing system. Solutions: In low winter temperatures, failure to turn off certain electrical devices can prevent the vehicle from starting, so remember to turn them off. Solutions: After removing the spark plugs, disconnect the fuel injector fuse, start the vehicle, drain the unburned fuel, clean and heat the spark plugs, then reinstall the spark plugs and fuse, and finally start the vehicle. Solutions: Visit a 4S shop for inspection and repair.

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OJames

08/10/25 10:42pm

I've repaired many Mercedes-Benz vehicles, and protection system failures usually have several common causes. Sensor issues are the most frequent, such as airbag sensors being covered in dust or water ingress causing false alarms, which often happens during the rainy season. Wiring faults are also very common—aging wires, rodent damage, or poor connections can lead to short circuits or open circuits, affecting signal transmission. Software bugs should not be overlooked; occasionally, compatibility issues arise after Mercedes system updates, displaying false faults. When the battery voltage is unstable, the system may falsely report protection failures. Additionally, there could be damage to the safety module itself or residual issues after a collision. The solution is to visit an authorized service center as soon as possible to scan for specific fault codes using a diagnostic tool. Avoid attempting DIY fixes, as this involves critical emergency braking and protection systems, posing significant driving risks that should not be delayed.

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