To throw codes for a 1999 456M GTA, what scanner is best?
phone based give most data I have found so the dongle that fits in obd2 port + phone ap like "torque" . I happen to use the kiwi dongle but there are many.
Get something like a bafx product ..about 22 dollars and use torque or my favorite is eobd facile Please note I have not tried on a 1999 vehicle so not sure the results .. You can get lite versions for free to try Sent from my moto g(7) using Tapatalk
If you get something that ties in with an app on a phone, get a Bluetooth version. That way you don't have to switch around your WiFi. I stopped using a WiFi version for this reason.
I have had good results with a BOSCH 1050 that connects to a phone using Bluetooth. just be sure that your phone is not connected to anything else on BT ( took me a couple hours and a call to support to work that out. about 50.00