If the AQB indication is displayed on the Mercedes E-Class (W211) dashboard, then a number of consumers in the passenger compartment (heater, electric power drive, etc.) are deactivated, first of all, we need to measure the parameters of the main CCM, in particular, its density, as well as the charging current at the PK from the generator. In most cases, the problem is due to the battery condition that is to be replaced.
