The condensed water drainage hose of the air-conditioning system may not be properly fitted.
In such a case condensed water from the air conditioning system could enter the passenger compartment of the vehicle, ending up in the footwells of the driver and passenger side and in the central tunnel. As a result, any electrical components installed there could be corroded and/or subjected to short circuits or leakage currents.
As a consequence, the SRS control unit could stop working, the vehicle may fail to start, the engine emergency run could be activated while driving, and the functioning of other components (e.g. the fuel pump, automatic/manual emergency call) could be adversely affected.
The Mercedes-Benz A-Class models affected by this recall were manufactured between 11 September 2017 and 10 February 2019.
Mercedes recall code: 8391001
Source: Rapex Alert 36/2020 A12/01206/20