Wideband Lambda Sensor Controller with Sensor http://www.grid.co.jp/press_lc-1.htm Unlike the O2 sensors and zirconia O2 sensors used in vehicles, this uses the latest BOSCH wideband UEGO linear O2 sensor, achieving accuracy exceeding that of conventional air-fuel ratio meters and professional analyzers. Accuracy: ±0.1 AFR. It was operating normally until it was removed.