I picked up one of the below last year and use the paid Torque app on an S4 via Bluetooth. Works great!

You can clear CEL and monitor multiple parameters in real time. Transmission temp, intake temp, throttle position, RPM, etc etc. It was well worth it.

http://www.amazon.com/gp/aw/d/B00OXP...=AIRZQC5NCIIMA


S4.tapatalk