Only a FIAT dealer can do this.
Most cars are equipped to reset oil change warning lights. If the Fiat Doblo does not have instructions in its manual, then you will have to have the dealer or a mechanic do it for you.
According to the doblo operating guide you have to take it to a fiat dealer to switch off the service light. I also asked my mechanic and he confirms this.
User manual (and my local FIAT garage) say this can only be done by a FIAT dealer
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according to autodata service lamp can only be reset using suitable diagnostic computer Dr.Pedro VolksWagen service technician
It is not recommended by the manufacturer to remove the speed limiter on a Fiat Doblo. The speed limiter is installed for the safety of the vehicle operator.
electrical
If your Fiat Doblo 1.9JTD is not displaying total mileage, the cable can be loose. Check the cable to ensure it is connected tightly.
in the fuse box