• O2 sensor is a sensor that detects the concentration of O2 (oxygen). It is said that the most common cause of the engine check lights to turn on, the O2 sensor abnormalities • If the O2 sensor malfunctions, there is a risk of the following effects: deterioration of fuel economy, emissions smell, engine warning light will turn on • O2 sensors have a life span of over 5 years or over 80,000 km. However, O2 sensors deteriorate with use, so if you feel the smell of exhaust gas is tight or fuel economy, it is important to replace and inspect early • ■O2 sensor (Oxygen sensor) • ■ Compatible genuine part number 36531-PTF-J01 36531-PFE-N03