Use the emergency key if the trunk can no longer be unlocked with the key or KEYLESS-GO. Note: The anti-theft alarm signal is triggered if you unlock the trunk with the emergency key. There are several options to stop the alarm:
Legend Trunk lock
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Climate control: Overview of climate control systems
Notes on climate control An interior air filter must always be used so that the air conditioning system, pollution level monitoring and the air filtering function work correctly. Make sure that the filter is installed correctly and the filter housing in the engine compartment is closed correctly usi ...