System and method for determining degradation of an exhaust gas sensor in an engine

摘要

A system and method for determining degradation of a post-catalyst exhaust gas sensor in an engine is provided. The engine is coupled to one or more exhaust gas catalysts. The method includes generating a first signal from a first exhaust gas sensor disposed downstream of a first catalyst. The method further includes determining an amount of oxygen supplied to one of the catalysts. Finally, the method includes determining degradation of the first exhaust gas sensor based on the amount of supplied oxygen and the first signal.