A method and system for monitoring a post-catalyst exhaust gas sensor (64,66) in an engine (12) is provided. The engine (12) includes a cylinder bank (16) coupled to a catalyst (52) and an exhaust gas sensor (64) disposed downstream of the catalyst (52) ge...

A system and method for determining degradation of a post-catalyst exhaust gas sensor (64) in an engine (12) is provided. The method includes generating a first signal from a first exhaust gas sensor (64) disposed downstream of a first catalyst (52). The m...

The regulation method has the fuel-air ratio adjusted in dependence on the oxygen content and the water content of the engine exhaust gases provided by respective probes (11,12) positioned in the exhaust gas line (7) after a catalyzer (8). An Independent c...

Fuel injection is switched off during a test interval or the fuel air ratio is altered. Reaction times (t1, t2) are measured, up to appearance of the resultant signal variation (rapid response) from the O2 sensors (3, 6). The difference ( DELTA t) is forme...

A method and system for controlling the air/fuel ratio in an internal combustion engine (12) having first and second groups of cylinders coupled to first and second exhaust banks (20,28), respectively. Each exhaust bank has a catalyst (16,24), a pre-cataly...