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.
Only a FIAT dealer can do this.
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.
Warning lights are an indication that something needs to be fixed. To reset a change oil light, one needs to change the oil of the car, and check the fuse.
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User manual (and my local FIAT garage) say this can only be done by a FIAT dealer
according to autodata service lamp can only be reset using suitable diagnostic computer Dr.Pedro VolksWagen service technician
If you mean that you have a warning light on, then once the problem that is causing the airbag warning light to come on is diagnosed and fixed, the light will reset itself.
hold the buton on the cluster then turn the key to ignition