Here is a smart kit that lets you monitor your engine air fuel ratio live on your iOS or Android device. The PE Wideband O2 is designed to help you make sure your engine is running at its best. You will need only 2 wires to install this. Once done, you can pair your smartphone to start monitoring your engine’s air fuel ratio.
The companion app displays adjustable history graphs and AFR or Lambda. The kit ships with a Bosch LSU 4.9 sensor. You can get yours here.