Oxygen / Fuel Sensors


DENSO have been leaders in the field of Oxygen Sensor design since the technology
became widely adopted by vehicle manufacturers in the early to mid 1990’s.  
The company pioneered Air/Fuel sensor technology which is used in many of
today’s more advanced vehicles. Through their industry reputation for reliability and
quality, DENSO have become one of the largest OE suppliers of these parts worldwide.  


  • Superior design maximizes engine performanceand fuel efficiency 
    while reducing fuel consumption and harmful emissions
  • First Time Fit delivers the right part the first time
  • Wide coverage and unique applications for Asian and European cars
  • Original equipment quality and reliability

The role of O2 Sensors

Oxygen Sensors (O2) work together with the vehicle’s fuel injection system, Catalytic Converter and
engine management system or electronic control unit (ECU) to help achieve the lowest possible
output of environmentally harmful engine emissions.

Theoretically, at this ratio, all of the fuel will be burned using almost all of the oxygen in the air.
The remaining oxygen must be exactly the right quantity for the Catalytic Converter to function efficiently.

The O2 Sensor monitors the percentage of unburned oxygen present in the car’s exhaust gases.

According to whether the oxygen content in the exhaust gas is too high (a lean mixture) or
too low (a rich mixture) the O2 Sensor transmits a fast-changing, fluctuating voltage signal to the ECU.

The ECU responds to this information by adjusting the air/fuel mixture entering the Catalytic Converter.
The goal is to keep the air/fuel ratio very close to the ‘stoichiometric’ point, which is the calculated
ideal ratio of air to fuel entering the Catalytic Converter.