Oxygen Sensor 2344513,22690AA960,234-4513,234 4523 for SUBARU

Oxygen sensor function
The oxygen sensor measures whether there is an excess of oxygen in the exhaust gas after engine combustion and converts the oxygen content into a voltage signal to transmit to the vehicle''s ECU.  The ECU judges whether the air-fuel ratio is low or high based on the electromotive force difference from the oxygen sensor and accordingly controls the duration of fuel injection, enabling the engine to achieve closed-loop control targeting the excess air factor.  This ensures that the three-way catalytic converter achieves maximum conversion efficiency for the three pollutants in the exhaust gas: hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOX), thereby maximizing the conversion and purification of emissions pollutants.
Oxygen sensor classification
There are two types of oxygen sensors in practical applications: zirconium oxide oxygen sensors and titanium oxide oxygen sensors. Commonly used oxygen sensors are divided into Rivini lead, double lead and two lead types; single lead is zirconium oxide oxygen sensor; double lead is titanium oxide oxygen sensor; two lead is cooling zirconium oxide oxygen sensor. Oxygen sensors with four lead types alone cannot be used as substitutes.