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:
How to adjust the volume
VOL (Volume control)-2
Turn the knob clockwise to increase the volume
...
Automatic air conditioning
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Force limiter system
In the event of a collision, each force limiter system will effectively absorb
the load applied to the seat belt to minimize the impact to the passenger. ...