A Wideband O2 Sensor (and Controller) is a sensor that you install in your exhaust to measure the Air Fuel Ratio (AFR) of your engine. The Wideband O2 Controller converts the signal from the sensor into an analog 0-5v voltage, which can be logged alongside other engine data allowing you to accurately tune your fuel maps using a Woolich Racing Log Box v3 and the AutoTune feature in the WRT software. 

By matching up the AFR data with engine data from the ECU, we can adjust the fueling to a more optimal level, to potentially enhance the performance and reliability of an engine.