Hi Rick,
OBD2 code number meanings are the same from one vehicle to another. It's a standardized system.
The only difference in vehicles is the protocol used to communicate.
On European, Asian and most Chrysler vehicles (our shop builds Viper parts), the protocol is ISO, which is why the code readers we have work on my Coupe. Just don't get a VPW, KWP ar VAG / Audi reader as they will not work on your Maserati.
When I had the engine running and started disconnecting injectors, all the codes that came up corresponded to the correct injector numbers.
The code reader has a small book with it that provides a full description of what each code number means.
The reader shows you the set of codes four times and if you leave it plugged in for about 3 minutes, it erases them and turns off the light.
It's a handy little tool that takes the mystery out of what the check engine light may be for.
Unfortunately, it doesn't help with trunk leaks and I have to take my car back to the dealer in Orlando (again) to fix the trunk leak. There's some sort of opening behind the rear bumper that's allowing the water to come in.
Regards,
Sean