Fuel injection amount learning process (diesel-powered vehicles)
To keep exhaust emissions and engine noise low, the engine very occasionally performs a learning process for the fuel injection amount.
The engine sounds slightly different from usual while the learning process is taking place. The change in the engine sound does not indicate a fault.
See also:
Vehicle care precautions
In order to maintain the value of your vehicle, it is necessary to perform regular
maintenance using the proper procedures. Always maintain your vehicle in compliance
with environmental pollution ...
Ventilation slots
The ventilation slots in front of the windscreen should be brushed clear after
a heavy snowfall so that the operation of the heating and ventilation systems will
not be impaired. ...
Automatic air conditioning
The air conditioning can only be used while the engine is running. ...