How to service an oxygen sensor on Subaru Forester?

In the process of oxygen sensor servicing, the pigtail and electrical connector that are permanently attached to it must be handled cautiously so as not to spoil them. Do not allow oil, dirt or any other foreign matter to touch the electrical connector or sensor; avoid using cleaning solvents. Do not drop or handle rough the sensor. The negative terminal cable should be disconnected, and the vehicle jacked up securely on jack stands in order to replace the sensor. In non-turbocharged models, behind flange between exhaust manifolds and front end of catalytic converter is where upstream oxygen sensor is located. This connector will usually be found at back of engine compartment traced along its harness by electrically wiring up with a sensor inside it that needs disconnection while removing unscrewing & taking out a connector.Similarly, remove this clip before unplugging it from whatever you are indicating and take away these clips from there.Do ensure that no anti-seize compound is applied on threads if installing old one.In turbocharged models however, the upstream oxygen sensor can be seen on the right exhaust manifold itself. Separate an electrical connector and detach clips holding-sensor harnesses. As for a right-front wheel, remove it together with service hole cover in wheel housing splash shield.The oxygen sensor screws out and comes off from right exhaust manifold.For location of downstream catalytic converter you'll find downstream oxygen sensors.The respective harnessed for such sensors are traceable through their connectors which may also require removing and turning out among others.Finally undo this screw then take out any left over fragment involving catalytic converter after having unscrewed it earlier.Hence no antiseptic lubricant is necessary for application into these.

Genuine Subaru Forester Oxygen Sensor

Oxygen O2 Sensor

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30 Oxygen Sensors found

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Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AB010
$151.31 MSRP: $221.22
You Save: $69.91 (32%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Oxygen; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2018 Subaru Forester | 2.0XT Premium, 2.0XT Touring | 2.0L H4
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Subaru Forester Air Fuel Ratio Sensor Assembly
Part Number: 22641AA650
$208.70 MSRP: $305.12
You Save: $96.42 (32%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio; Oxygen Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2018 Subaru Forester | 2.0XT Premium, 2.0XT Touring | 2.0L H4
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Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AA960
$122.30 MSRP: $177.25
You Save: $54.95 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor; Rear Oxygen
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2011-2018 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring, X, X Limited, X Premium | 2.5L H4, 2.5L H4 DOHC
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Subaru Forester Oxygen Sensor Air Fuel Ratio Sensor
Part Number: 22641AA280
$191.75 MSRP: $280.33
You Save: $88.58 (32%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor, Sensor
- Replaces: 22641AA140
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2003-2004 Subaru Forester | X, XS | 2.5L H4
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Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AA640
$180.12 MSRP: $263.33
You Save: $83.21 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Oxygen; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 22690AA420, 22690AA540
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1999-2004 Subaru Forester | Base, L, S, X, XS | 2.5L H4, 2.5L H4 SOHC
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Subaru Forester Oxygen Sensor
Part Number: 22641AA670
$230.10 MSRP: $336.40
You Save: $106.30 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio; Air/Fuel Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2016 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring | 2.5L H4
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Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AA900
$160.27 MSRP: $234.32
You Save: $74.05 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Oxygen
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2009-2013 Subaru Forester | XT, XT Limited | 2.5L H4 DOHC Turbo
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Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AA520
$192.66 MSRP: $281.67
You Save: $89.01 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Oxygen; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004-2008 Subaru Forester | Forester Sports, XT | 2.5L H4 Turbo
View related parts
Subaru Forester Air Fuel Ratio Sensor Assembly
Part Number: 22641AA140
$191.75 MSRP: $280.33
You Save: $88.58 (32%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio
- Replaced by: 22641AA280
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2003 Subaru Forester | X, XS | 2.5L H4
View related parts
Subaru Forester Air Fuel Ratio Sensor Assembly
Part Number: 22641AA710
$233.36 MSRP: $341.17
You Save: $107.81 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2017-2018 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring | 2.5L H4
View related parts
Subaru Forester Air Fuel Ratio Sensor Assembly
Part Number: 22641AA420
$193.34 MSRP: $282.67
You Save: $89.33 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor, Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010 Subaru Forester | XT, XT Limited | 2.5L H4 DOHC Turbo
View related parts
Subaru Forester Air Fuel Ratio Sensor Assembly
Part Number: 22641AA610
$199.75 MSRP: $292.03
You Save: $92.28 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2011-2013 Subaru Forester | X, X Limited, X Premium | 2.5L H4 DOHC
View related parts
Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AA810
$140.80 MSRP: $205.85
You Save: $65.05 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Oxygen; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2010 Subaru Forester | Forester Sports, L.L.Bean, X, X Limited, XS | 2.5L H4, 2.5L H4 SOHC
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Subaru Forester Link Assembly, Pack
Part Number: 22641AA360
$174.06 MSRP: $254.47
You Save: $80.41 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor, Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2010 Subaru Forester | Forester Sports, L.L.Bean, X, X Limited, XS | 2.5L H4, 2.5L H4 SOHC
View related parts
Subaru Forester Air Fuel Ratio Sensor Assembly
Part Number: 22641AA211
$201.95 MSRP: $295.25
You Save: $93.30 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Air/Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor, Sensor
- Replaced by: 22641AA450
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004-2008 Subaru Forester | Forester Sports, XT | 2.5L H4 Turbo
View related parts
Subaru Forester Air/Fuel Sensor Assembly
Part Number: 22641AA78A
$245.39 MSRP: $358.75
You Save: $113.36 (32%)
ADD TO CART
Product Specifications
- Other Name: A/F Ratio Sensor Assembly ; Sensor Assembly-Air/Fuel Ratio
- Replaces: 22641AA760
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2025 Subaru Forester | Base, Limited, Premium, Sport, Touring | 4 Cyl 2.5L
View related parts
Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AA491
$192.66 MSRP: $281.67
You Save: $89.01 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Oxygen; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 22690AA490
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004-2008 Subaru Forester | Forester Sports, XT | 2.5L H4 Turbo
View related parts
Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AB08A
$159.27 MSRP: $232.85
You Save: $73.58 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Oxygen
- Replaces: 22690AB070
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2025 Subaru Forester | Base, Limited, Premium, Sport, Touring | 4 Cyl 2.5L, 4 Cyl 2.5L Hybrid
View related parts
Subaru Forester Oxygen Sensor Assembly
Part Number: 22690AB070
$159.27 MSRP: $232.85
You Save: $73.58 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assy Oxygen
- Replaced by: 22690AB08A
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2021 Subaru Forester | Base, Limited, Premium, Sport, Touring
View related parts
Subaru Forester Oxygen Sensor
Part Number: 22641AA760
$245.39 MSRP: $358.75
You Save: $113.36 (32%)
ADD TO CART
Product Specifications
- Other Name: Sensor Assy Air Fuel Ratio
- Replaced by: 22641AA78A
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2021 Subaru Forester | Base, Limited, Premium, Sport, Touring

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1-20 of 30 Results

Subaru Forester Oxygen Sensor

The Subaru Forester Oxygen Sensor constantly checks the amount of oxygen in the exhaust of the Forester and sends voltage feedback to the engine control computer so that the air-fuel mixture remains balanced for both efficient combustion and low emissions. The Oxygen Sensor is located in the exhaust stream and contains a zirconium dioxide element, coated with platinum. When heated to about 600°F, it produces a voltage of up to 0.9V for rich mixtures and down to 0.1V for lean mixtures. The computer analyzes this signal and quickly changes injector pulse width, which allows the system to work in closed loop for optimal Subaru catalytic converter performance. Late-model Subaru vehicles use at least two sensors on each Forester. There is an upstream Oxygen Sensor before the catalytic converter that guides fuel control and a downstream one after the converter that monitors catalyst efficiency. All Oxygen Sensors feature an internal heater to achieve operating conditions faster, a steel shell threaded to adapt to the vehicle, a vent opening to receive reference air, and wiring leads that connect to the Subaru harness to ensure proper Forester fuel economy and emissions. Output from a properly functioning Oxygen Sensor will keep operation responsive, whereas a slow response may be caused by a degraded Oxygen Sensor, and a failed sensor may cause rich mixtures.

Our website stands as the go-to online destination for OEM Subaru Forester Oxygen Sensor. With complete lines of genuine Subaru Forester Oxygen Sensor available at unbeatable market prices, we ensure top quality, reliability, and durability. Each part comes backed by the manufacturer's warranty, reinforcing your trust in our offerings.

Subaru Forester Oxygen Sensor Parts Questions & Experts Answers

Oxygen Sensor Assembly
22690AA491
Q:
How to service an oxygen sensor on Subaru Forester?
Posted by Lora T.
A:
In the process of oxygen sensor servicing, the pigtail and electrical connector that are permanently attached to it must be handled cautiously so as not to spoil them. Do not allow oil, dirt or any other foreign matter to touch the electrical connector or sensor; avoid using cleaning solvents. Do not drop or handle rough the sensor. The negative terminal cable should be disconnected, and the vehicle jacked up securely on jack stands in order to replace the sensor. In non-turbocharged models, behind flange between exhaust manifolds and front end of catalytic converter is where upstream oxygen sensor is located. This connector will usually be found at back of engine compartment traced along its harness by electrically wiring up with a sensor inside it that needs disconnection while removing unscrewing & taking out a connector.Similarly, remove this clip before unplugging it from whatever you are indicating and take away these clips from there.Do ensure that no anti-seize compound is applied on threads if installing old one.In turbocharged models however, the upstream oxygen sensor can be seen on the right exhaust manifold itself. Separate an electrical connector and detach clips holding-sensor harnesses. As for a right-front wheel, remove it together with service hole cover in wheel housing splash shield.The oxygen sensor screws out and comes off from right exhaust manifold.For location of downstream catalytic converter you'll find downstream oxygen sensors.The respective harnessed for such sensors are traceable through their connectors which may also require removing and turning out among others.Finally undo this screw then take out any left over fragment involving catalytic converter after having unscrewed it earlier.Hence no antiseptic lubricant is necessary for application into these.
Answered by Subaru Parts Specialist Gary / Jan 06, 2025