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HO2S Bank 1 Sensor 2
The scan tool range is
0-1275 mV (0-1.275 volts). This parameter indicates the output voltage for
HO2S bank 1 sensor 2 (post catalyst
oxygen sensor). The voltage should fluctuate within a range between about
50 mV (lean exhaust) and
800 mV (rich exhaust) while operating in Closed Loop. The post-catalyst HO2S output voltage will fluctuate slowly over a longer period of time, compared to the fuel control oxygen sensor s. This is due to the oxygen storage capacity of an efficiently operating catalyst.