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Choose from top brands including: DensoNGKBoschWalker ProductsAPINTKMando

Air Fuel Ratio SensorMost cars produced for the American market after 1980 have an air fuel ratio sensor, also known as an oxygen sensor. This device is part of the emissions control system and provides a data stream to the computer that manages your fuel ignition. By detecting the amount of fuel vapor in the air stream going to the engine, the air fuel ratio sensor can tell the computer whether it needs to adjust the fuel mixture to be richer or leaner. Every fuel has a slightly different formulation, but your air fuel ratio sensor is concerned primarily with ensuring that the fuel to air mixture is at the correct level for your engine. Depending on the engine, the ideal air to fuel mixture is about fifteen to one, meaning fifteen parts air to one part fuel. If the engine receives less fuel than this, it has a hard time combusting, producing poor performance and possibly damaging the engine. A too-lean mixture also produces excessive nitrogen-oxide pollution from your tailpipe. A too-rich mixture is just as bad, however. The unburned fuel creates pollution of a particularly nasty type, spewing gasoline directly into the air. To avoid both of these problems, it's important to keep your air fuel ratio sensor in good working order. A sensor failure will often be detected by the onboard computer, and will result in a check engine light or similar diagnostic message. You may also be able to detect a failing sensor if your fuel efficiency or observed engine performance begin to fall off without some other explanation. Replacing a broken or failing air fuel ratio sensor is not a particularly complicated job but it is critical to get the right sensor for your car or truck's engine control computer. Sensors are not generic parts and each engine computer has its own line of sensors. Be sure to get the right part to keep your engine working at its peak performance for year after year.

Replacement Air Fuel Ratio Sensors

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Review Fitment Notes
Upstream Denso Air Fuel Ratio Sensor - for 2002 Toyota Tacoma RWD - 234-9001 Click to Enlarge
5 Stars
Denso 234-9001
Air Fuel Ratio Sensor
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Part Number: 234-9001
Brand: Denso
Notes: OE Style -- DENSO is the O.E. Manufacturer / Air Fuel Ratio Sensor
  • Manufactured to detect the amount of exhaust gas air fuel ratio
  • Constructed from durable material
  • Features zirconia solid electrolyte
  • Highly accurate
  • Easy installation
Position: Upstream
Condition: New
Sensor Type: Heated
Shipping Options: Ground
$125.43
(99) In Stock
This Part Fits:
Catalog: B
Vehicle Sub Model
2002 Toyota Tacoma RWD
Upstream Right NGK Air Fuel Ratio Sensor - for 2004 Nissan Titan 5.6L V8 - 24320 Click to Enlarge
5 Stars
NGK 24320
Air Fuel Ratio Sensor
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Part Number: 24320
Brand: NGK
Notes: Direct Fit 5-Wire A/F Sensor -- B2S1; OE Equivalent Design
  • NTK oxygen sensors are equipped with OEM specified connectors and attaching hardware for easy installation. Dual-coated platinum element to increase longevity and ensure the quickest response time.
  • NTK oxygen sensors heat up rapidly to meet requirements of the vehicle to improve fuel economy and reduce emissions. NTK's proprietary ceramic element overcoat protects against sensor failure.
  • NTK is constantly improving sensor designs to provide excellent performance and improve resistance to failure. NTK works with their OEM manufacturers through each phase of development from concept to production.
Position: Upstream Right
Condition: New
Shipping Options: Ground
$86.43
View Details
This Part Fits:
Catalog: B
Vehicle Engine
2004 Nissan Titan 5.6L V8
Bosch Air Fuel Ratio Sensor - for 2002 Toyota Tacoma S-Runner - W0133-1601078 Click to Enlarge
Website Reviews
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Part Number: W0133-1601078
Brand: Bosch
Condition: New
Shipping Options: Ground, Overnight, 2 Day
OEM
List Price:
$278.47
Our Price: $140.58
(5) In Stock
This Part Fits:
Catalog: A
Vehicle Sub Model
2002 Toyota Tacoma S-Runner
Upstream Walker Products Air Fuel Ratio Sensor - for 2004 Acura TSX - W0133-1896016 Click to Enlarge
Website Reviews
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Part Number: W0133-1896016
Brand: Walker Products
Notes: At catalyst inlet.
  • Tarnish-proof platinum electrodes
  • Base ceramic probe of Zirconium and Yttrium
  • Patented Platinum Power Grid
  • Fine particle filter
Position: Upstream
Condition: New
Shipping Options: Ground, Overnight, 2 Day
List Price:
$600.04
Our Price: $170.58
(4) In Stock
This Part Fits:
Catalog: A
Vehicle
2004 Acura TSX
Upstream Front API Air Fuel Ratio Sensor - for 2001 Lexus RX300 3.0L V6 - 1900-524154 Click to Enlarge
Website Reviews
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Part Number: 7880-07329881
Brand: API
Notes: Air / Fuel Ratio Sensor -- California Emmissions
Position: Upstream Front
Condition: New
Shipping Options: Ground
$97.98
View Details
This Part Fits:
Catalog: P
Vehicle Engine
2001 Lexus RX300 3.0L V6
Upstream NTK Air Fuel Ratio Sensor - for 1997 Honda Civic D16Y5 - W0133-1839907 Click to Enlarge
Website Reviews
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Part Number: W0133-1839907
Brand: NTK
Notes: At catalyst inlet.
Position: Upstream
Condition: New
Shipping Options: Ground, Overnight, 2 Day
OEM
List Price:
$777.21
Our Price: $352.58
(10) In Stock
This Part Fits:
Catalog: A
Vehicle Engine Transmission
1997 Honda Civic D16Y5 Manual
Upstream Mando Air Fuel Ratio Sensor - for 2013 Hyundai Sonata 2.4L 4 Cyl ELECTRIC/GAS - 18A1414 Click to Enlarge
Website Reviews
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Part Number: 18A1414
Brand: Mando
Notes: New Original Equipment
Position: Upstream
Condition: New
Shipping Options: Ground
$126.43
(8) In Stock
This Part Fits:
Catalog: B
Vehicle Engine
2013 Hyundai Sonata 2.4L 4 Cyl ELECTRIC/GAS
Upstream Left Dorman Air Fuel Ratio Sensor - for 2010 Lexus RX450h - W0133-1930271 Image is not vehicle specific
Website Reviews
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Part Number: W0133-1930271
Brand: Dorman
Notes: Production: 01/01/2009-, Before Catalyst - Radiator Side
Position: Upstream Left
Condition: New
Shipping Options: Ground, Overnight, 2 Day
List Price:
$288.81
Our Price: $155.58
View Details
This Part Fits:
Catalog: A
Vehicle Production Range
2010 Lexus RX450h Fr:01-01-09
Upstream Right NGK Air Fuel Ratio Sensor - for 2006 Nissan Titan 5.6L V8 - 24320 Click to Enlarge
5 Stars
NGK 24320
Air Fuel Ratio Sensor
Loading Reviews...
Part Number: 24320
Brand: NGK
Notes: Direct Fit 5-Wire A/F Sensor -- B2S1; OE Equivalent Design
  • NTK oxygen sensors are equipped with OEM specified connectors and attaching hardware for easy installation. Dual-coated platinum element to increase longevity and ensure the quickest response time.
  • NTK oxygen sensors heat up rapidly to meet requirements of the vehicle to improve fuel economy and reduce emissions. NTK's proprietary ceramic element overcoat protects against sensor failure.
  • NTK is constantly improving sensor designs to provide excellent performance and improve resistance to failure. NTK works with their OEM manufacturers through each phase of development from concept to production.
Position: Upstream Right
Condition: New
Shipping Options: Ground
$87.08
(33) In Stock
This Part Fits:
Catalog: H
Vehicle Engine
2006 Nissan Titan 5.6L V8
Upstream NGK Air Fuel Ratio Sensor - for 2009 Honda S2000 2.2L 4 Cyl - 24820 Click to Enlarge
Website Reviews
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Part Number: 24820
Brand: NGK
Notes: Direct Fit 4-Wire A/F Sensor -- B1S1; OE Equivalent Design
  • NTK is constantly improving sensor designs to provide excellent performance and improve resistance to failure. NTK works with their OEM manufacturers through each phase of development from concept to production.
  • NTK oxygen sensors heat up rapidly to meet requirements of the vehicle to improve fuel economy and reduce emissions. NTK's proprietary ceramic element overcoat protects against sensor failure.
  • NTK oxygen sensors are equipped with OEM specified connectors and attaching hardware for easy installation. Dual-coated platinum element to increase longevity and ensure the quickest response time.
Position: Upstream
Condition: New
Shipping Options: Ground
$218.98
View Details
This Part Fits:
Catalog: C
Vehicle Engine
2009 Honda S2000 2.2L 4 Cyl
Upstream Left Denso Air Fuel Ratio Sensor - for 2010 Toyota Sienna - 234-9049 Click to Enlarge
5 Stars
Denso 234-9049
Air Fuel Ratio Sensor
Loading Reviews...
Part Number: 234-9049
Brand: Denso
Notes: OE Style -- DENSO is the O.E. Manufacturer / Air Fuel Ratio Sensor
Position: Upstream Left
Condition: New
Sensor Type: Heated
Shipping Options: Ground
$113.98
(40) In Stock
This Part Fits:
Catalog: T
Vehicle
2010 Toyota Sienna
Upstream Denso Air Fuel Ratio Sensor - for 2011 Mazda 3 - 234-5015 Click to Enlarge
5 Stars
Denso 234-5015
Air Fuel Ratio Sensor
Loading Reviews...
Part Number: 234-5015
Brand: Denso
Notes: OE Style -- Except Calif.; O.E. Quality Replacement Sensor
Position: Upstream
Condition: New
Sensor Type: Heated
Shipping Options: Ground
$123.98
(1) In Stock
This Part Fits:
Catalog: N
Vehicle
2011 Mazda 3

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A properly installed Bosch Air Fuel Ratio Sensor examines the oxygen level that is feeding your car's engine cylinders.

Bosch Bosch Air Fuel Ratio Sensor

Usually the hardest thing about repairing a vehicle is finding a dependable source for quality parts such as a Bosch air fuel ratio sensor. Take your car to a superlative level of power and performance by installing performance parts. It doesn't matter if you race your vehicle or just enjoy driving a performance vehicle, the best quality aftermarket and OEM parts are critical. Auto enthusiasts who love optimized vehicles recognize that nothing is more crucial than having the highest quality replacement parts for your vehicle. A properly installed air fuel ratio sensor continually tracks how much oxygen that is forced your car or truck's engine cylinders. In cases where the air-fuel ratio is too low, poor performance will be the aftermath; at the same time, a too-rich ratio leads to excessive wear to your engine and unwanted air pollution from the car or truck's exhaust system. The air fuel ratio sensor has a crucial job: getting the engine to function productively without making exorbitant emissions. The air fuel ratio sensor calculates the air-fuel ratios in the engine, keeping them within established ranges for optimum performance.

A high quality Denso Air Fuel Ratio Sensor examines the oxygen level that is going your Denso's engine.

Denso Denso Air Fuel Ratio Sensor

The perfect parts for the job, like a Denso air fuel ratio sensor, are just a few clicks away when you get them from PartsGeek. Your high-performance vehicle demands the best replacement parts that are available. No matter if you race or just enjoy driving a performance vehicle, premium quality aftermarket and OEM parts are crucial. An automobile's performance is the culmination of several factors including high quality parts. The air fuel ratio sensor has a vital responsibility: getting the vehicle to work effectively without causing unreasonable pollution. When your car or truck's air-fuel ratio is too lean, poor engine power will be the result; conversely, a too-rich ratio leads to wear to your engine and excessive air pollution from your car or truck's tailpipe. A high quality air fuel ratio sensor examines how much oxygen that is forced your vehicle's engine cylinders. A car's air fuel ratio sensor keeps track of the air to fuel levels in the motor, keeping them within established ranges for good operation. Your car or truck is really only as good as the parts it uses, such as a Denso air fuel ratio sensor.

A properly installed Walker Air Fuel Ratio Sensor monitors how much oxygen is going your Walker's engine.

Walker Walker Air Fuel Ratio Sensor

If you're in the market for a Walker air fuel ratio sensor, restoring your car or truck with first class parts always pays off in the long run. Your car is special due to its excellent performance and great style, so to have it humming in its best condition you want the ultimate in quality parts and accessories. You purchased that high-performance car because it had high-end engine power and performance, support that investment by buying only the best new parts and accessories. To add to the horses of your vehicle's motor, add a selection of these optional components that are specifically built to raise performance. The air fuel ratio sensor has a key duty: getting your vehicle to function efficiently without causing unnecessary exhaust. A properly installed air fuel ratio sensor continually tracks how much oxygen is forced your vehicle's engine. If the air-fuel ratio is not adequate, reduced combustion will be the consequence; in addition, a too-rich fuel mix leads to wear to your engine and unwanted pollution from your vehicle's tail pipe. Because an inaccurate air fuel ratio sensor may wreck your finances by running too rich or too lean, replacing it will lower your stress over time.

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Are unexplained performance problems bogging you down? If you haven't checked your air fuel ratio sensor, go ahead and check it now. This sensor is part of your vehicle's engine management system: a computer-controlled array of self-diagnostic devices that monitors and reports everything from engine knock to crank angle in order to maintain optimum performance and efficiency.

The AFR sensor contributes to this system by reporting the concentration of gasoline vapors in the air. This allows the computer to adjust the gas content to make the mix richer or more lean. When this sensor fails, gas to air mixtures often stay out of an ideal range for extended periods of time. This causes low performance and rough idling, as well as increased emissions. Auto manufacturers are replacing older zirconium sensing technology with these more responsive wide range air fuel sensors. The two have almost identical purposes, and there are similar symptoms when they fail.

We're proud to offer millions of parts made by some of the best OEM and independent brands here at PartsGeek.com. You'll find top sensor manufacturers, including Bosch, Denso, NGK and Walker. These fuel mix sensors aren't generic parts, so double and triple check to make sure you have the right sensor for your vehicle's engine computer. However, don't worry if you make a mistake in ordering. We're committed to getting you the right part, so every purchase you make is protected by our 30-day return policy.

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A modern air fuel ratio sensor maintains a stoichiometric optimum between gasoline vapor and air in order to ensure full combustion. The fast fuel mix ratio correction speed allowed by wide range air fuel sensors is necessary to deliver the high fuel economy and low emissions of contemporary vehicles. Precisely tuned mixes also contribute to smooth idling and peak performance.

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Each one of these AFR sensors should cost anywhere from $50-250, depending on the make and model of your vehicle. Labor varies based on a number of different factors:

  • The mechanic's hourly rate
  • Minimum labor charges and fees
  • The location of the sensor on your vehicle

Most professionals do this job in minutes, but certain garages have a minimum labor charge of an hour. A few vehicles require significant disassembling to get to the sensor, but usually it's a quick fix.

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There are many names for this part:

  • Air fuel ratio sensor
  • Wide range air fuel sensor
  • Oxygen sensor
  • O2 sensor
  • AFR sensor
  • Air fuel mixture sensor

They all usually mean the same thing, but always double check that you have the correct part for your year and model. You might also see any of them called a meter instead of a sensor. One last thing: don't confuse this part with a mass sensor. While it's closely related, an air mass sensor is a separate part that complements the functions of an air fuel mixture sensor.

Shop Popular Models
Some of our Customer Reviews
5 of 5
Verified Customer
4/10/13 10:32 AM - USA

very reliable and fast shipping - chet webb

- 2001 Ford F150 Air Fuel Ratio Sensor
5 of 5
Verified Customer
3/8/13 06:06 AM - USA

I got the part from this website and was really satisfied with the item and was exactly as described. The item arrived at the said date. - fidelboy13

- 2002 Toyota Sienna Air Fuel Ratio Sensor
5 of 5
Verified Customer
5/29/13 01:21 AM - USA

I'm going to buy it a week ago and now that I came back to buy it because I saved money now the price went up 20 bucks gosh! I should of bought it a week ago - Jazmin

- 2002 Honda Civic Air Fuel Ratio Sensor
5 of 5
Verified Customer
6/2/13 08:02 PM - USA

I put this part on my 05 Camry Base Model after my check engine light came on. After installation, check engine light went off and fuel economy increased significantly. It was very simple to install. Parts Geek was speedy with the ordering and shipping process. - KP

- 2005 Toyota Camry Air Fuel Ratio Sensor
5 of 5
Verified Customer
6/2/13 12:01 PM - USA

Parts works well and good price.. - Tacoma Guy

- 2002 Toyota Tacoma Air Fuel Ratio Sensor
5 of 5
Verified Customer
6/10/13 01:08 PM - USA

Great product!!! Engine light has not come on since replacement. Best price out there! - Happy Yota

- 2004 Toyota Tacoma Air Fuel Ratio Sensor