Free app with full custom PID support, no hidden fees: https://itunes.apple.com/us/app/engine-link-le/id1222128102?ls=1&mt=8LELink new version is an engine performance and diagnostics tool for both automotive enthusiasts and professionals with better performance. Connecting to your iPhone/iPod, this scanner allows you to easily scan and clear engine codes, view and save real-time engine and performance data and much more.Bluetooth Low EnergyLow energy footprint and longer battery time Fast refresh rate Automatic configure / connect Plug and Play. NO Pairing is needed Requires: iPhone 4s or later iPad 3rd gen or later iPad mini or later iPod touch 5th gen or later Supported Apps: Engine Link - OBD II vehicle monitoring and diagnosisOBD Fusion - OBD2 vehicle scan tool and diagnosticsezOBDLeafSpy Pro Mode6 OBD ScannerDyno Chart - OBD II Engine Performance Tool EngineLink features: + Display vehicle live data with full customizable gauge set + Show and reset a DTC / CEL / fault code like a scan tool + Graph data + MPG widget to plot real time fuel efficiency + Heads up display / HUD mode for night time driving+ Read Transmission Temperatures (vehicle dependent) + Horsepower (HP), Torque, and acceleration + Boost / vacuum gauge + Engine speed / Engine RPM / Engine Load / Coolant / Fuel Tank+ Full configurable GUI with user choice of dial, bar, plot, digital, and on-off gauge as display elements + Formula support + Preloaded GM and Ford PID, standard PID, Prius PID libraries and more + User can add more libraries within the app or by using iTunes File Sharing + Background color option + Email user log function + Multiple PID formula support + 0 to 60mph timer and quarter mile timer