Method for monitoring exhaust gas purification system of internal combustion engine, involves comparing signal of nitrogen-oxide sensor with signal of another nitrogen-oxide sensor

摘要

The method involves comparing a signal of a nitrogen-oxide sensor with a signal of another nitrogen-oxide sensor (60). The nitrogen-oxide sensor is arranged flow direction of exhaust gases before an oxidizing exhaust gas treatment component. Exhaust gas components of nitric oxide and nitrogen-oxide sensor utilize one of the nitrogen-oxide sensors for diagnostic function. An independent claim is also included for a device for monitoring an exhaust gas purification system an internal combustion engine.