Oxygen & Air/Fuel Sensors

  • Oxygen Sensors
  • A/F Sensors
  • Sensor Positioning

    • Superior Design Maximizes Engine Performance and Fuel Efficiency

      DENSO's light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration the oxygen sensor goes into "open loop," which basically means that the engine management computer system ignores the oxygen sensor. Oxygen sensors have a smaller range of limits in detecting and adjusting the difference from an optimum air/fuel ratio.

      As the automotive industry continues to improve on their standards DENSO is keeping the pace with advancements in our engineering to meet the demands from the industry. Also, as car owners are holding on to their vehicles for longer periods, DENSO continues to make auto parts available for those critical replacement parts for all applications.

      Oxygen Sensors


      Oxygen sensors, also known as Lambda sensors or O2 sensors among some vehicle manufacturers, are among the most sensitive and critical components on your car's engine. Earlier fuel injection systems employed one oxygen sensor in the exhaust system to maintain closed-loop air/fuel mixture control. However, today's engines may use as many as four sensors, which monitor not only exhaust gas oxygen content but catalytic converter efficiency as well. In order to perform these functions properly, the sensors must adhere to OE standards within incredibly close tolerances. A malfunctioning or incorrectly calibrated oxygen sensor can hurt driveability and illuminate the malfunction indicator, resulting in costly and time-consuming repairs. DENSO First Time Fit® oxygen sensors are designed to meet those tolerances and more. The DENSO oxygen sensor catalog offers one of the most complete product lines in the industry, from Acura to Volvo.



      1. Robotic Laser Weld 2. Porous PTFE Filter Allows atmospheric oxygen to enter the sensor without permitting water or engine contaminants to seep into the casing. 3. Double Protection Cover Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning. 4. Stainless Steel Housing Resists corrosion and contamination with a rugged, watertight body. 5. Aluminum-Oxide Trap Layer Keeps silicone and lead outside the ceramic elient through DENSO's exclusive design, preventing damage to the platinum electrode.

      Features:

      • Corrosion-resistant stainless steel construction
      • PTFE filter blocks efficiency-robbing contaminants
      • Refined zirconia element improves sensor response

      Benefits:




      • Superior design maximizes engine performance while reducing fuel consumption and harmful emissions



      • First Time Fit® delivers the right part the first time



      • Ensures smog test compliance

      Oxygen Sensor Positioning



      Many manufacturer’s catalogs identify the left and right side positioning; however, diagnostic tools refer to sensor locations by Bank and Sensor (e.g. Bank 1 Sensor 1).

      In the diagrams below, the longitudinal engine orientation illustrations depict rear-wheel drive. In cases of transverse engine (front wheel drive), the concepts are the same, however the mounting direction is at a 90 degree rotation left or right from longitudinal.


      Engine configurations will vary. Please review your service manual or online technical references for accurate engine configurations.


      Three-Sensor Exhaust Systems

      In the case of three-sensor exhaust systems, we may have Bank 1 Sensor 1/2/3.

    • Mapping Air/Fuel Ratios Throughout RPM Range for Reduced Emissions

      DENSO's air/fuel ratio sensor began to appear in the early 90s as vehicle manufacturers increased demands for better emission standards. DENSO's air-to-fuel ratio sensor were developed to measure the air-to-fuel ratio information under a wider range of driving conditions. The air/fuel ratio sensor sends information to the engine management computer to makes adjustments based on driving conditions. This wider range and variable adjustments controls the motor to burn fuel more efficient and produce less emissions.

      As the automotive industry continues to improve on their standards DENSO is keeping the pace with advancements in our engineering to meet the demands from the industry. Also as light duty fleet owners are holding on to their vehicles for longer periods, DENSO continues to make auto parts available for those critical replacement parts for all applications.

      As oxygen sensor technology has evolved, DENSO's engineers have been there every step of the way. From the first thimble-type sensors to heated, quick-response sensors required to meet ever more stringent emissions regulations, DENSO has supplied the OE industry with quality components. DENSO continues to innovate with the latest development in oxygen sensors, known as air/fuel sensors. These components, also known as wide-band oxygen sensors, have a broader response range to provide much finer control of air/fuel mixtures over a greater variety of operating conditions. DENSO helped to develop this important new technology. Consumers can rely on DENSO First Time Fit® air/fuel sensors.

      Features:

      • Tarnish-proof platinum electrodes provides longer life and maintains accuracy
      • Quick-response planar zirconia element can quickly detect oxygen concentration
      • Measures A/F ratios from approximately 12:1 to 19:1

      Benefits:




      • Increased performance by mapping air/fuel ratios throughout RPM range



      • Reduces emissions by keeping the air-fuel mixture at an optimum ratio



      • Reduces fuel consumption and maximizes catalytic converter life

    • In the diagrams below, the longitudinal engine orientation illustrations depict rear-wheel drive. In cases of transverse engine (front wheel drive), the concepts are the same, however the mounting direction is at a 90 degree rotation left or right from longitudinal.


      Engine configurations will vary. Please review your service manual or online technical references for accurate engine configurations.


      Three-Sensor Exhaust Systems

      In the case of three-sensor exhaust systems, we may have Bank 1 Sensor 1/2/3.