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These are the conditions for the 2019 E class stop / start:
the ECO start/stop function is switched on.
the brake system does not require a running engine.
the outside temperature and atmospheric air pressure is within the range that is suitable for the system.
the engine is at normal operating temperature.
no engine diagnosis are active.
the engine speed is within the range that is suitable for the system.
the transmission oil temperature is within the range that is suitable for the system.
the temperature in the vehicle interior is within the set range.
the fuel tank is sufficiently filled.
the system detects that there is no moisture on the windscreen when the air conditioning system is switched on.
the charge level and the voltage of the battery are sufficient.
the battery temperature is within the range that is suitable for the system.
the system does not recognise a steep uphill or downhill gradient.
the bonnet is closed.
AIR BODY CONTROL does not raise the level.You’re literally wasting your money.
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Soul
@Dammit
If DDR tell me that everything is optimal then I'll take their word for it. These cars have two batteries, I'm wondering if the auxiliary is feeling a bit poorly - or as you say, maybe it's a case of 'they all do that sir'.