If you just want to pull DTCs the 3100 looks like it will do a good job ... but you can get the same functionality for a lot less. It doesn't take much to read/clear DTCs. With the 3100, you're paying about $80 more just for the built-in DTC descriptions. Grab the DTC with a $20-30 scanner and Google it.
If you are wanting to monitor engine variables, it doesn't look like the 3100 capable. I'd suggest getting an ODB/CAN-to-USB (or -Bluetooth) adapter and one of the monitoring programs/apps that are available.
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