Oxygen Sensor

Oxygen Sensors & Components

  • TRQ® - Oxygen Sensor
    TRQ®Oxygen Sensor
    0
    # sp240483
    Oxygen Sensor by TRQ®. If your oxygen sensor fails, replace it with this top-grade part developed to easily fix the problem. Built to fit and function exactly as the part it is replacing, the product provides excellent OEM performance...
    Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
    $30.95 - $194.95
  • Weapon-R® - CEL Eliminator
    Weapon-R®CEL Eliminator
    1
    # sp232898
    CEL Eliminator by Weapon-R®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...
    Made of high Quality MaterialsGets rid of the Check Engine Light
    $41.00
  • ACDelco® - GM Genuine Parts™ Oxygen Sensor Wire Guide
    ACDelco®GM Genuine Parts™ Oxygen Sensor Wire Guide
    0
    # sp260350
    GM Genuine Parts™ Oxygen Sensor Wire Guide by ACDelco®. GM Genuine Parts Cable Ties are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are the true OE parts installed during...
    Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
    $0.61
  • TRQ® - Oxygen Sensor Set
    TRQ®Oxygen Sensor Set
    0
    # sp260366
    Oxygen Sensor Set by TRQ®. TRQ oxygen sensors are manufactured to precise specifications using premium raw materials to optimize your vehicle’s emission system. Each sensor is isostatically-pressed for improved strength and...
    Intended to bring your vehicle back to its original gloryBudget-friendly alternative to the OEM part
    $51.95 - $189.95
  • Vemo® - Nitrogen Oxide (NOx) Sensor
    Vemo®Nitrogen Oxide (NOx) Sensor
    0
    # sp263032
    Nitrogen Oxide (NOx) Sensor by Vemo®. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.
    Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
    $415.33 - $770.39
  • Denso® - Oxygen Sensor
    Denso®Oxygen Sensor
    30
    # sp202958
    Oxygen Sensor by Denso®. Make sure your engine runs efficiently and produces fewer emissions by replacing your malfunctioning fuel-ratio sensors with these top-notch products designed by Denso. Engineered with the use of the...
    Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
    $18.93 - $723.23
  • Motorcraft® - Oxygen Sensor
    Motorcraft®Oxygen Sensor
    1
    # sp99067
    Oxygen Sensor by Motorcraft®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver...
    Built to strict Ford Motor Company specificationsRecommended by Ford Motor Company
    $28.34 - $172.86
  • Bosch® - Premium Oxygen Sensor
    Bosch®Premium Oxygen Sensor
    13
    # sp99084
    Premium Oxygen Sensor by Bosch®. A worn-out oxygen sensor can cause engine performance problems and shorten the life of the catalytic converter. Tune-up your vehicle with an Oxygen Sensor from Bosch that is equally efficient in...
    OE Identical ConnectorCompact Design
    $22.89 - $275.22
  • Walker Products® - Premium Oxygen Sensor
    Walker Products®Premium Oxygen Sensor
    2
    # sp196246
    Premium Oxygen Sensor by Walker Products®. Walker Oxygen Sensors are precision made for outstanding performance and manufactured to meet or exceed all original equipment specifications and test requirements. The oxygen sensor is a...
    Improved Engine Response & PerformanceLower Emissions
    $21.01 - $189.35
  • Denso® - Air Fuel Ratio Sensor
    Denso®Air Fuel Ratio Sensor
    7
    # sp94914
    Air Fuel Ratio Sensor by Denso®. Make sure your engine runs efficiently and produces fewer emissions by replacing your malfunctioning fuel-ratio sensors with these top-notch products designed by Denso. Engineered with the use of the...
    Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
    $50.12 - $637.06
  • ACDelco® - Genuine GM Parts™ Oxygen Sensor
    ACDelco®Genuine GM Parts™ Oxygen Sensor
    6
    # sp248673
    Genuine GM Parts™ Oxygen Sensor by ACDelco®. If your O2 sensor is not functioning properly, you are robbing yourself of performance and costing yourself money at the gas pump. Let ACDelco’s GM OE Oxygen Sensor help.
    ACDelco GM OE Oxygen Sensors earn the name ACDelco by being put through a variety of tests, often under extreme and unusual conditionsDetects oxygen content in the exhaust gases
    $20.51 - $306.92
  • Bosch® - Wideband Oxygen Sensor
    Bosch®Wideband Oxygen Sensor
    4
    # sp92988
    Wideband Oxygen Sensor by Bosch®. This sensor utilizes a sophisticated sensing element enabling it to produce a precise output in proportion to the air/fuel ratio. Wideband sensors use a more sophisticated sensing element that provides...
    Detects the exact amount of unburned fuel in the exhaust streamOE connectors and OE-style harness for continuous wire from connector to sensor
    $51.38 - $566.84
  • NTK® - Oxygen Sensor
    NTK®Oxygen Sensor
    12
    # sp5156
    Oxygen Sensor by NTK®. This product is designed to improve engine efficiency and fuel mileage, while reducing emissions and extending catalyst life. The oxygen sensor is made of premium quality material and extensively tested during...
    Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
    $15.46 - $287.23
  • Walker Products® - Oxygen Sensors
    Walker Products®Oxygen Sensors
    0
    # sp210482
    Oxygen Sensors by Walker Products®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality...
    High quality at an affordable priceExpertly made from premium materials
    $18.87 - $285.38
  • Spectra Premium® - Oxygen Sensor
    Spectra Premium®Oxygen Sensor
    3
    # sp99297
    Oxygen Sensor by Spectra Premium®. To ensure your vehicle has optimal performance and fuel economy while producing minimal emissions replace a defective O2 sensor with one backed by the aftermarket’s most rigorous testing process. It...
    Increase vehicle fuel economy and engine performance while decreasing vehicle exhaust emissions100% performance tested to meet vehicle requirements
    $15.23 - $323.26
  • Bosch® - Oxygen Sensor
    Bosch®Oxygen Sensor
    0
    # sp99083
    Oxygen Sensor by Bosch®. The Bosch oxygen sensor utilizes a mix of zirconium and yttrium oxides and other elements to form a tough base that withstands the intense stress to which oxygen sensors are subjected. Each element is incredibly...
    OE-EquivalentOE Style connectors and wire lengths
    $20.59 - $455.61
  • Walker Products® - Premium Wideband Oxygen Sensor
    Walker Products®Premium Wideband Oxygen Sensor
    0
    # sp196248
    Premium Wideband Oxygen Sensor by Walker Products®. Walker Oxygen Sensors are precision made for outstanding performance and manufactured to meet or exceed all original equipment specifications and test requirements. The oxygen sensor...
    High quality at an affordable priceExpertly made from premium materials
    $43.79 - $283.01
  • Walker Products® - Premium Air Fuel Ratio Oxygen Sensor
    Walker Products®Premium Air Fuel Ratio Oxygen Sensor
    0
    # sp196245
    Premium Air Fuel Ratio Oxygen Sensor by Walker Products®. Walker Oxygen Sensors are precision made for outstanding performance and manufactured to meet or exceed all original equipment specifications and test requirements. The oxygen...
    Designed to meet or exceed OE specifications in form, fit and functionGlobal coverage for import and/or domestic applications
    $44.65 - $248.99
  • Delphi® - Oxygen Sensor
    Delphi®Oxygen Sensor
    2
    # sp5756
    Oxygen Sensor by Delphi®. As one of the leading suppliers of oxygen sensor technology since 1978, Delphi planar technology is the result of their OE and aftermarket engineers partnering together to develop the most innovative oxygen...
    Resists high temperatures, vibration damage and wire corrosion to protect signal accuracy, and long lifePatented sensors construction and design
    $18.99 - $280.17
  • NTK® - Air-Fuel Ratio Sensor
    NTK®Air-Fuel Ratio Sensor
    1
    # sp121602
    Air-Fuel Ratio Sensor by NTK®. Air/Fuel Ratio Sensors Utilize a Sophisticated Sensing Element that Enables Them to Produce a Precise Output in Proportion to the Air/Fuel Ratio. AFR Sensors Provide the ECU with an Exact AFR Response,...
    Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
    $39.18 - $285.42
  • DIY Solutions® - Oxygen Sensor
    DIY Solutions®Oxygen Sensor
    0
    # sp241854
    Oxygen Sensor by DIY Solutions®. If you're seeking to get your steel stallion back to its tip-top condition, then this top-notch replacement solution is what you should definitely look out for. When it comes to quality, reliability and...
    Designed to help restore your vehicle to its former gloryQuick replacement to let you enjoy an awesome ride again
    $24.13 - $248.38
  • Denso® - Universal Fit Oxygen Sensor
    Denso®Universal Fit Oxygen Sensor
    0
    # sp118924
    Universal Fit Oxygen Sensor by Denso®. Make sure your engine runs efficiently and produces fewer emissions by replacing your malfunctioning fuel-ratio sensors with these top-notch products designed by Denso. Engineered with the use of...
    Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
    $16.88 - $82.40
  • Mopar® - Oxygen Sensor
    Mopar®Oxygen Sensor
    1
    # sp110098
    Oxygen Sensor by Mopar®. Want your prized possession to look and perform the way it was designed to? Then top-of-the-line Mopar automotive parts and accessories are for you. Made using the latest manufacturing technology to meet the...
    Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology
    $5.95 - $859.39
  • Crown® - Oxygen Sensor
    Crown®Oxygen Sensor
    0
    # sp13449
    Oxygen Sensor by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!
    Developed to improve your driving experienceConstructed to ensure ultimate operation
    $46.60 - $122.21
  • Walker® - Oxygen Sensor
    Walker®Oxygen Sensor
    0
    # sp26976
    Oxygen Sensor by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker accessories, you get...
    Makes installation quick and easyOptimal OE-style fit and quality
    $52.12 - $383.68
  • ACDelco® - GM Original Equipment™ Oxygen Sensor
    ACDelco®GM Original Equipment™ Oxygen Sensor
    0
    # sp27192
    GM Original Equipment™ Oxygen Sensor by ACDelco®. If your O2 sensor is not functioning properly, you are robbing yourself of performance and costing yourself money at the gas pump. Let ACDelco’s GM OE Oxygen Sensor help.
    ACDelco Professional Oxygen Sensors earn the name ACDelco by being put through a variety of tests, often under extreme and unusual conditionsCustomers can receive better gas mileage with a properly working oxygen sensor
    $62.38 - $111.16
  • Bosch® - Air Fuel Ratio Sensor
    Bosch®Air Fuel Ratio Sensor
    0
    # sp143423
    Air Fuel Ratio Sensor by Bosch®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver...
    High quality at an affordable priceExpertly made from premium materials
    $69.45 - $303.35
  • Bosch® - Universal Oxygen Sensor
    Bosch®Universal Oxygen Sensor
    0
    # sp119178
    Universal Oxygen Sensor by Bosch®. Properly functioning oxygen sensors are important when it comes to your vehicle's fuel efficiency and reducing harmful exhaust emissions. That's why checking for, and possibly replacing, a worn-out...
    Patented SmartLink™ connector systemNo special tools required for installation
    $32.57 - $50.66
  • Delphi® - OE Connector Oxygen Sensor
    Delphi®OE Connector Oxygen Sensor
    0
    # sp107208
    OE Connector Oxygen Sensor by Delphi®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and...
    Delphi planar technology covers older, conical design sensorsPatented protective sensor coating helps prevent contamination
    $46.11 - $355.43
  • Walker® - Air Fuel Ratio Sensor
    Walker®Air Fuel Ratio Sensor
    0
    # sp26974
    Air Fuel Ratio Sensor by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker accessories, you...
    Makes installation quick and easyOptimal OE-style fit and quality
    $215.34




An oxygen sensor detects the amount of unburned oxygen in the engine exhaust and references it to the amount of oxygen in the atmosphere. It creates a voltage signal based on the difference that is sent to the engine control computer. The amount of voltage indicates whether the air/fuel mixture is rich or lean. In response, the computer varies fuel injector pulse width (on time) to control the air/fuel mixture. Although the computer also relies on inputs from other sensors regarding engine temperature, engine load, and throttle position, the oxygen sensor is the one that provides feedback and allows the engine control system to operate in “closed loop”, the operating mode that provides optimal catalytic converter efficiency and minimal exhaust emissions. When an oxygen sensor gets old or is damaged by contaminants, it may not be able to provide a timely signal to the computer. Without accurate feedback the computer can’t adjust the air/fuel mixture to suit engine operating conditions, which may result in increased emissions. If you’re in need of a replacement oxygen sensor, you’ll find what you need to restore performance and emissions compliance here on our digital shelves.

An oxygen sensor has a zirconium dioxide sensing element coated on both sides with platinum, which also serves as electrodes, encased in ceramic. The electrodes are connected to wire leads that attach to the vehicle wiring harness and the ceramic enclosure is encased in a steel shell. The steel shell is threaded for installation in the exhaust and it protects the sensing element. Openings in the steel shell adjacent to the sensing element tip allow the sensor to be exposed to exhaust gas. All modern oxygen sensors contain a heating element that is also connected to the wiring harness. Openings at the top of the sensor allow outside air to enter the sensor, which is then heated. When heated, oxygen ions move from the inside to the outside platinum layer, and the potential difference generates a voltage. When the air/fuel mixture is rich and there is little unburned oxygen in the exhaust, up to 0.9V is generated. When the mixture is lean and there is a high concentration of unburned oxygen in the exhaust, the voltage signal will fall to 0.1V.

All late model cars and trucks have at least 2 oxygen sensors, one mounted in the exhaust manifold or exhaust pipe before the catalytic converter and one mounted in the exhaust after the converter. Vehicles with V6 or V8 engines have at least 4, one before and one after each converter in the exhaust from each cylinder bank. The upstream, before catalyst, oxygen sensor is the primary sensor that provides feedback to the engine control computer. High voltage indicates a rich air/fuel mixture and low voltage indicates a lean air/fuel mixture. When the voltage signal is low the computer increases the injector pulse width to richen the mixture; when the voltage signal is high, the computer reduces the injector pulse width to lean the mixture. The voltage signal from the oxygen sensor constantly cycles between rich and lean conditions, as often as several times per second, and in turn, the computer constantly adjusts the air/fuel mixture to achieve a balance that allows the catalytic converter to function effectively.

Oxygen sensors operate at approximately 600°F (315°C), and the heater is included in modern sensors to allow them to heat up faster so the system can quickly go into closed loop. When viewed on a diagnostic oscilloscope, an upstream oxygen sensor at operating temperature should produce a uniform waveform that varies between 0.1V and 0.9V with a midpoint of approximately 0.45V. The downstream oxygen sensor is also known as a catalyst monitor because it indicates converter efficiency. In contrast to the upstream sensor, the downstream sensor should have a relatively flat waveform at approximately 0.45 volts if the catalytic converter is functioning properly. If the downstream sensor signal and diagnostic scope waveform are similar to the upstream sensor, it means that the converter is not functioning efficiently. If this occurs a Diagnostic Trouble Code (DTC) will be set in the computer and the CHECK ENGINE light will illuminate.

Oxygen sensors deteriorate with age and contamination. Sensors can become contaminated due to exposure to silicates from coolant leaks, silicone from using the wrong type of RTV sealant, phosphorus from oil consumption due to worn piston rings and/or valve guides, excessive carbon buildup, and exposure to other chemicals, even those in gas additives. When the sensor becomes contaminated it loses the capability to quickly react to changes in the air/fuel mixture, resulting in reduced converter efficiency and increased emissions. If the sensor fails completely, the system will default to a fixed rich air/fuel mixture, which increases emissions and reduces fuel mileage. A deteriorating or completely failed oxygen sensor will set one or more DTCs and illuminate the CHECK ENGINE light. Oxygen sensor function can be checked with a scan tool or digital multi-meter, or as indicated above, with a diagnostic oscilloscope. Sensor response can be checked by artificially enriching the air/fuel mixture with propane and by removing a vacuum line to create a lean condition.

Instead of the conventional oxygen sensor described above, some newer vehicles use an air/fuel ratio sensor. Whereas the traditional sensor is a narrow range sensor that provides an alternating rich/lean signal to the engine control computer, an air/fuel ratio sensor can measure a much broader range of air/fuel mixtures, which is why such sensors are called “wideband”. The signal from an air/fuel ratio sensor is a much more accurate representation of the actual air/fuel ratio. Instead of the sensor generating a voltage, the engine computer provides a reference voltage to the sensor, and the computer then monitors the sensor output current. Although an air/fuel ratio sensor functions differently than a conventional oxygen sensor, it can suffer from the same defects and exhibit the same failure symptoms.

No matter what vehicle you’re working on or the type or position of the defective oxygen sensor, we have the replacement sensor needed to restore proper performance, reliability, fuel economy, and emissions compliance. We offer components that are manufactured to original equipment specifications, so when repairs are completed you can count on the performance your vehicle was designed to deliver. In addition to oxygen sensors, we have related components that may be needed to affect a complete repair including connectors, relays, wiring harnesses, extension harnesses, bungs, nuts, plugs, gaskets, and more.

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Oxygen Sensors Reviews

105 reviews
It sure does sense oxygen.
Posted by Eddie (Calimesa, CA) / July 18, 20212007 Mercedes CLK Class
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