If the converter efficiency http://www.bergenav.com/ is poor due to contamination, the downstream O2 sensor output will look like the upstream O2 sensor output; that is the post cat oxygen sensor will switch more frequently between lean and rich voltage levels just like the pre cat oxygen sensor. Further diagnosis is needed to determine why the cylinder is misfiring. Hence faulty sensors need to be diagnosed and replaced promptly. Fortunately there are ways oxygen sensor testing can be done using OD2 code reader. The oxygen sensor eventually needs to be replaced in all vehicles. A P0300 code will be set in the event of an engine misfire. Hence all light duty vehicles from 1996 onwards were manufactured with OBD feature. The response time of oxygen sensor may vary from 0.3 sec to 0.125 sec depending on the oxygen sensor specification. Further Diagnosis Is Needed To Determine Why The Cylinder Is Misfiring. In an efficiently working catalytic converter, the upstream oxygen sensor will swi

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