Oxygen sensor is used for detecting the content of oxygen in exhaust, which is a major
component for ensuring actual air/fuel ratio of engine to approaching theoretical air/fuel
ratio.
Oxygen sensor is mounted on the exhaust front pipe, before 3-way catalyst converter.
Oxygen sensor mainly consists of a ceramics shell made of zirconium oxidize,on which the
internal/external surface of closed side is coated with platinum, with a protect tube out the
ceramics and a metal housing out the ceramics for protecting. The external surface of
zirconium oxidize is exposed to exhaust gas and internal surface is exposed to atmosphere.