Year, make, model, mods... Start there when posting questions.

You can scan with tuner, but need a laptop while riding. Aeroforce Gauge scans. Torque Pro is an android app that scans but you need a OBDII Bluetooth device that costs $20, $5 for the app and you can record it to, reset codes. It all just depends what you want to do and how far you want to go. To start, the Torque App route has the least investment with most return.

good luck