Sensor in operative relationship to a catalytic converter. The method comprises the Steps of
providing a base fuel Signal related to a quantity of air inducted into the engine and
generating a bias Signal for biasing the base fuel Signal towards a leaner air/fuel ratio. The
output of the NO sensor is monitored to detect a predetermined exhaust gas NO value
representing a predefined NO conversion efficiency. The base fuel signal is then modified as
a function of the bias Signal corresponding to the predetermined exhaust gas NO value to …