HO2S Bank 1 Sensor 1

The scan tool range is 0-1275 mV (0-1.275 volts). This parameter indicates the output voltage for HO2S bank 1 sensor 1 (rear bank fuel control oxygen sensor). The voltage should fluctuate constantly within a range between about 50 mV (lean exhaust) and 800 mV (rich exhaust) while operating in Closed Loop.