HO2S Bank 1 Sensor 1

Range (0.750 to 3.999)
This parameter displays the lambda value produced by the wide band oxygen sensor. A lambda value of 1 is equal to the stoichiometric air fuel ratio of 14.7:1. When the exhaust is lean, the oxygen level will be high and the lambda value will be high (greater than 1). When the exhaust is rich, the oxygen level will be low and the lambda value will be low (less than 1).