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Oxygen Sensor

Some telltale signs that your oxygen sensor is starting to fail include the check engine light coming on, poor fuel economy, and the engine running rough. Get a replacement as soon as you confirm that your oxygen sensor is bad. The great news is that here at CarParts.com, we have an oxygen sensor replacement for every application (upstream, downstream, before/after the catalytic converter, etc.). Choose from our wide range of high-quality O2 sensors manufactured by the most reputable names in the industry. Take a look at our products today.

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Oxygen Sensor - 4-Wire, Heated
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : Before Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - 4-Wire, Heated
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : Before Catalytic Converter, Front Or RearType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - 4-Wire, Heated
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : Before Catalytic Converter, Driver Or Passenger SideType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - 4-Wire, Heated
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : Before Or After Catalytic Converter, Driver Or Passenger SideType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Set of 2
Part Number: SET-REPB960901-2
0 Reviews
Vehicle Info Required to Guarantee Fit
$53.66
Product Details
Location : Before Catalytic Converter, Driver And Passenger SideComponents : (2) Oxygen SensorsType : 4-wireQuantity Sold : Set of 2Recommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Set of 2
Part Number: SET-REPB960901-2
0 Reviews
Vehicle Info Required to Guarantee Fit
$53.66
Product Details
Location : Before Or After Catalytic Converter, Driver And Passenger SideComponents : (2) Oxygen SensorsType : 4-wireQuantity Sold : Set of 2Recommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Before and After Catalytic Converter, Driver and Passenger Side, Set of 4
0 Reviews
Vehicle Info Required to Guarantee Fit
$105.53
Product Details
Location : Before And After Catalytic Converter, Driver And Passenger SideComponents : (4) Oxygen SensorsType : 4-wireQuantity Sold : Set of 4Recommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 16.5 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024470, 2344209, 21006Connector Gender : Male ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : After Catalytic Converter, Driver Or Passenger SideType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 13.8 in. wire lengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024836, 15895Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : After Catalytic Converter, Front Or RearType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 13.8 in. wire lengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024836, 15895Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : After Catalytic Converter, FrontType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 13.8 in. wire lengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024836, 15895Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : After Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 13.8 in. wire lengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024836, 15895Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$28.24
Product Details
Location : Before Catalytic Converter, Driver SideType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 13.8 in. wire lengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024836, 15895Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$25.30
Product Details
Location : Before Catalytic Converter, Driver Or Passenger SideType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 15.7 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024708Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$25.30
Product Details
Location : After Catalytic Converter, Front Or RearType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 15.7 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024708Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Oxygen Sensor - Sold individually
0 Reviews
Vehicle Info Required to Guarantee Fit
$25.30
Product Details
Location : After Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyRecommended Use : OE ReplacementProduct Fit : Direct FitWire Length : 15.7 in. Wire LengthThread Size : M18-1.5 Thread SizeMounting Style : Threaded-in Mounting StyleHex Size : 7/8 in. Hex SizeInterchange Part Number : 25024708Connector Gender : Female ConnectorWarranty : 1-year DriveWire unlimited-mileage warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Page 1 of 746 | Showing 1 - 15 of 11188 results

Oxygen Sensor Customer Reviews

We have returned the Oxygen Sensor as they were not the correct ones. We are waiting on the refund.
William Sarantopoulos
VERIFIED PURCHASER
Purchased on May 11, 2020
DriveWire® Oxygen Sensor - 4-Wire, Heated
Jul 03, 2019
Oxygen sensor working just fine
I bought all 4 oxygen sensors and soon I install them on my 3 seris BMW problem was gone. so all I can say is Thank you very much aouto parts wearhouse also I will definitely come back if I need another part.
Purchased on May 14, 2017
I got two of these for our 01 BMW 740i. It was an easy swap and they fit perfectly. The same oxygen sensor from the dealer would cost close to $200 each. These are highly recommended.
Purchased on Mar 11, 2009

Oxygen Sensor Guides

Oxygen Sensor Buyer's Guide 

Summary

  • Oxygen sensors work by monitoring the amount of oxygen in the exhaust pipe.  An oxygen sensor sends a signal to the Engine Control Unit (ECU) to adjust the amount of fuel injected in the combustion chambers.
  • The three most common types of oxygen sensors are the Zirconia 02 sensor, Titania 02 sensor, and Wide Band 02 sensor.
  • Faulty oxygen sensor signs include rotten egg smell from exhaust pipes, irregular engine idling, and poor gas mileage.
  • It is important to have a faulty oxygen sensor replaced because not only does it cause harm to the environment, but it’s also vital to your vehicle’s overall performance.

Car pollutants cause long-term damage to the environment. However, car owners can reduce the amount of harmful substances emitted by their car’s exhaust system with the help of an oxygen sensor. Apart from helping the environment, oxygen sensors also play a role in keeping your car engine’s health at its best.

What is an oxygen sensor and how does it work?

Oxygen sensors work by monitoring the amount of oxygen in the exhaust pipe. Too much or too little oxygen is not good for the engine’s health. The oxygen sensor helps create a balance by sending a signal to the Engine Control Unit (ECU) to adjust the amount of fuel injected into the combustion chambers.

Oxygen sensors can either be installed in the front or rear of the car. A front oxygen sensor is installed at the front exhaust pipe near the catalytic converter or at the exhaust manifold. It is responsible for keeping the air-fuel ratio at an ideal level. In some cars, an air-fuel ratio sensor is sometimes used instead of a front oxygen sensor.

A rear oxygen sensor is mounted right after the catalytic converter. It is usually mounted in the exhaust itself. The rear oxygen sensor is usually used to monitor the performance of the catalytic converters.

Volvo was the first to use oxygen sensors in the1970s. The first oxygen sensors were made from Zirconia, with only one or two wires on it. Older vehicles were only equipped with one oxygen sensor. Every automobile manufactured after the 1980s is equipped with an oxygen sensor.

Over the years, the demand for oxygen sensors has changed. Today’s vehicles can have up to eight oxygen sensors, depending on capacity. Cars with 4-cylinder engines usually have two oxygen sensors installed, while other vehicles with  V6 and V8 must have at least four oxygen sensors installed.

What are the types of oxygen sensors?

There plenty of oxygen sensors available today. These can be classified into three types: Zirconia O2 sensors, Titania O2 sensors, and Wide Band O2 sensors.

Zirconia Oxygen Sensors

Zirconia oxygen sensors are the most common type of O2 sensors. This type of oxygen sensor can further be classified into unheated and heated zirconia oxygen sensors.

Unheated oxygen sensors rely on heat to send signals to the ECU. One drawback is that it takes a lot of time for the exhaust to heat up and the signal may not be sent the signal at the right time. This may confuse the ECU, causing it to go back to its default setting and releasing the wrong amount of fuel to the combustion chambers.

Heated oxygen sensors are more advanced because it has a heater circuit installed. This automatically heats up the sensor when starting the car, making it more efficient than unheated oxygen sensors. A heated oxygen sensor also decreases the possibility of error by sending timely, accurate signals to the ECU.

Titania Oxygen Sensors

What makes this type unique is that it is made of a ceramic material rather than the usual zirconia. It also uses a different process in sending signals to the ECU. Titania oxygen sensors are usually found in limited edition vehicles only.

Wide-Band Oxygen Sensors

This is a new type of oxygen sensor which is not yet widely used. This type of sensor creates a higher level of voltage than a zirconia oxygen sensor, making it more efficient in balancing the air-fuel ratio in the engine’s exhaust pipes.

When is the right time to replace an oxygen sensor?

It is important to have a faulty oxygen sensor replaced because it can cause serious performance problems.

Have your car checked by a mechanic as soon as the “check engine light” illuminates. If you notice an unusual smell, similar to rotten eggs, coming from your engine’s exhaust, it's likely that your oxygen sensor is bad. Other signs to look out for are irregular engine idling and poor gas mileage.

What to consider when buying an oxygen sensor?

An OEM replacement oxygen sensor is usually priced at $20 to $100. Take note that O2 sensor prices will really depend on the model and make of your car. Some are priced more than the estimate. Aftermarket oxygen sensors are also available.

Oxygen sensors are usually sold individually or in sets of two and four. If you want to replace an oxygen sensor yourself, check your manual to ensure you have the correct specs for a replacement.

Which oxygen sensor should you buy?

Installing the wrong type of oxygen sensor can cause problems in the vehicle. With today's automobiles equipped with at least two, or even three or four oxygen sensors, it can be a challenge to identify which one is not working correctly if you don't have enough DIY auto repair experience. The information below can help you learn more about oxygen sensors, so you can get the correct replacement for your vehicle.

Oxygen sensors are always numbered this way:

  • Bank 1 Sensor 1
  • Bank 2 Sensor 1
  • Bank 1 Sensor 2
  • Bank 2 Sensor 2

Other manufacturers code their oxygen sensors this way, which is why it can sometimes be very confusing. However, they all mean the same:

  • Sensor 1/1 or O2s 1/1
  • Sensor 2/1 or O2s 2/1
  • Sensor 1/2 or O2s 1/2
  • Sensor 2/2 or O2s 2/2

Now here's a detailed list to know which is which:

  • Bank 1 is located at the side of the engine where cylinder #1 is found as well.
  • Bank 2 is on the opposite side of Bank 1.
  • On a 4-cylinder engine, there is only one bank that's called Bank 1.
  • Sensor 1 is the upstream sensor located before the catalytic converter.
  • Sensor 2 is the downstream sensor located after the catalytic converter.
  • Sensor 3 is the only downstream sensor in situations where there are two sensors before the catalytic converter and only one after it. On other cars, this is read as Bank 1 Sensor 3.

CarParts.com has a high-quality oxygen sensor for every application (upstream, downstream, before / after catalytic converter). Our O2 sensors are sourced from the most reputable manufacturers in the industry, so you can rest assured that you're getting a high-quality replacement. Enter your vehicle's year, make, model, and engine into our vehicle selector to narrow down our selection to your application.

Helpful Automotive Resources

P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3
September 22, 2020
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3Bank 1 is the side of the engine where the #1 cylinder is located. P0042 code is set when your car’s PCM determines a potential problem with the heater element circuit of the oxygen sensor.
P0170 Code: Fuel Trim (Bank 1)
September 16, 2020
P0170 Code: Fuel Trim (Bank 1)The stoichiometric mixture best suited for burning is 14.7 parts air to 1 part fuel. If the mixture contains excessive amounts of air, the PCM will add more fuel to balance out the lean mixture. Conversely, too much fuel leads to a rich mixture, and the computer compensates accordingly.
P2187 Code: System too Lean at Idle (Bank 1)
September 10, 2020
P2187 Code: System too Lean at Idle (Bank 1)The term “bank 1” only applies in vehicles with V-engine and flat layouts. It refers to the side where the number 1 cylinder is located. Note that there is only one bank if your car has a straight engine.  The term “bank 1” only applies in vehicles with V-engine and
P0139 Code: O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)
September 10, 2020
P0139 Code: O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)Diagnostic trouble code (DTC) P0139 stands for “O2 Sensor Circuit Slow Response (Bank 1, sensor 2).” It indicates that the powertrain control module (PCM) has detected a potential issue with the signal from the rear oxygen sensor on bank 1.  Diagnostic trouble code P0139 indicates that the powertrain control module
P2270 Code: O2 Sensor Signal Biased / Stuck Lean (Bank 1, Sensor 2)
September 09, 2020
P2270 Code: O2 Sensor Signal Biased / Stuck Lean (Bank 1, Sensor 2)Diagnostic Trouble Code (DTC) P2270 stands for “O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 2).” It warns that the #2 oxygen sensor on bank 1 continually sends the voltage signal for a lean mixture instead of the proper air to fuel ratio calculated by the power control module or
P0145 Code: O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
November 02, 2020
P0145 Code: O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)Diagnostic trouble code (DTC) P0145 stands for “O2 Sensor Circuit Slow Response (Bank 1 Sensor 3).” It is logged when the powertrain control module (PCM) detects a slow response time from a downstream oxygen sensor.
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