Hi, i used to have a 2003 QP and i did resete the service light with the OBD2 reader, also a friend of mine he just disconected the battery for arround 30 min and connected again and the light goes off, try firs with the battery and if the light does not goes off then go to a local parts sotore or go online and buy an OBD2 reader a good one should not cost more than a 150 USD, or ether way go to your locar MASERATI dealership and they will reset it for you, hope it helps and have a great day.
NOTE: The OBD2 port is underneath the dash, on the driver's side just to the right of the steering column. (in most QP left hand drive cars)
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