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:
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Washing
Chemicals contained in the dirt and dust picked up from the road surface can
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Frequent washing and waxing is the best way ...
Vehicle care
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 any environmental pollut ...