What is the function and operation of the Oxygen Sensor (02S) in vehicle exhaust systems on Volvo 940?

The Oxygen Sensor (02S) produces an electrical voltage in response to oxygen content in exhaust gases, and is generally mounted in the exhaust manifold, and some models have internal heating for faster response. It gives a voltage between 0 and 1 volt, with lower voltages representing lean mixture and higher voltages representing rich mixture, with the ideal fuel to air ratio represented by voltages between 0.4 and 0.6 volts. Later models are equipped with two sensors for tracking the effectiveness of the catalytic converter, one tracking emissions before the converter and the other tracking emissions after the converter, giving the effectiveness of the reduction of emissions. The sensor has a specific temperature that it needs to work, and is in the OPEN LOOP mode until the engine has reached this ideal temperature, then it becomes CLOSED LOOP mode, so that the engine controller can control the air-fuel mixture depending on readings from the sensor. A Heated Oxygen Sensor (H02S) ensures optimal temperature for faster CLOSED LOOP operation where the engine controller uses information from the sensor to adjust the injector pulse width, while in OPEN LOOP the engine controller uses preprogrammed values. For testing, the H02S is disconnected and supply voltage to the heating element is checked, followed by resistance checks and continuity tests for proper function. Removing the battery by disconnecting the battery, jacking the vehicle up, carefully remove the sensor with suitable tooling, installing the sensor includes applying anti-seize compound and tightening to specified torque before reconnecting the wiring harness and lowering the vehicle.

Genuine Volvo Oxygen Sensor

Oxygen O2 Sensor

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83 Oxygen Sensors found

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Volvo Oxygen Sensor Part Number: 8627750
$217.82 MSRP: $324.15
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Product Specifications
- Other Name: Heated Oxygen Sensor; Air / Fuel Ratio Sensor; Oxygen Sensor
Fits the following Volvo Models:
- C70 | 2000-2001 | Base | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS
- S60 | 2001 | 2.4T, Base, T5 | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS
- S70 | 2000 | AWD, Base, GLT, GLT SE, T5 | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS
- V70 | 2000-2002 | 2.4T, AWD, Base, GLT, GLT SE, R AWD, T5, X/C, X/C AWD SE | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS
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Volvo Oxygen Sensor Part Number: 30622252
$232.60 MSRP: $276.90
You Save: $44.30 (16%)
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2003-2005 | 2.4, Base | 5 Cyl 2.4 L GAS
- V70 | 2004 | 2.4, 2.5T, 2.5T AWD, R, T5 | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- XC70 | 2004 | Base | 5 Cyl 2.5 L GAS
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Volvo Oxygen Sensor Part Number: 30650090
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor
Fits the following Volvo Models:
- V70 | 2005-2007 | 2.4, 2.5T, R, T5 | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- XC70 | 2005-2007 | Base, Ocean Race | 5 Cyl 2.5 L GAS
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Volvo Oxygen Sensor Part Number: 30677175
$199.85 MSRP: $237.92
You Save: $38.07 (16%)
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor
Fits the following Volvo Models:
- S40 | 2004-2010 | 2.4i, i, T5, T5 R-Design | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- V50 | 2005-2010 | 2.4i, i, T5, T5 R-Design | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
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Volvo Oxygen Sensor, Passenger Side Part Number: 30681335
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- XC90 | 2007-2014 | 3.2, 3.2 R-Design | 6 Cyl 3.2 L GAS
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Volvo Oxygen Sensor, Driver Side Part Number: 30713592
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S80 | 2007-2010 | V8 | 8 Cyl 4.4 L GAS
- XC90 | 2005-2011 | V8, V8 Ocean Race, V8 Sport | 8 Cyl 4.4 L GAS
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Volvo Oxygen Sensor, Driver Side Part Number: 30713594
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
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Product Specifications
- Other Name: Heated Oxygen Sensor; Air/Fuel Ratio Sensor; Front Oxygen Sensor, Oxygen Sensor
Fits the following Volvo Models:
- S80 | 2007-2010 | V8 | 8 Cyl 4.4 L GAS
- XC90 | 2005-2011 | V8, V8 Ocean Race, V8 Sport | 8 Cyl 4.4 L GAS
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Volvo Oxygen Sensor Part Number: 30751797
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Air / Fuel Ratio Sensor; Oxygen Sensor
Fits the following Volvo Models:
- S40 | 2007-2010 | 2.4i, T5, T5 R-Design | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- V50 | 2007-2010 | 2.4i, T5, T5 R-Design | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
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Volvo Oxygen Sensor, Passenger Side Part Number: 30751864
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Air/Fuel Ratio Sensor; Front Oxygen Sensor, Oxygen Sensor
Fits the following Volvo Models:
- S80 | 2007-2010 | V8 | 8 Cyl 4.4 L GAS
- XC90 | 2005-2011 | V8, V8 Ocean Race, V8 Sport | 8 Cyl 4.4 L GAS
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Volvo Oxygen Sensor, Passenger Side Part Number: 30751865
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S80 | 2007-2010 | V8 | 8 Cyl 4.4 L GAS
- XC90 | 2005-2011 | V8, V8 Ocean Race, V8 Sport | 8 Cyl 4.4 L GAS
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Volvo Oxygen Sensor Part Number: 30756122
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2011-2016 | T6, T6 Polestar, T6 R-Design, T6 R-Design Platinum | 6 Cyl 3.0 L GAS
- S80 | 2007-2015 | 3.2, T6 | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- V60 | 2015-2016 | T6 Polestar, T6 R-Design, T6 R-Design Platinum | 6 Cyl 3.0 L GAS
- V70 | 2008-2010 | 3.2 | 6 Cyl 3.2 L GAS
- XC60 | 2010-2016 | 3.2, 3.2 R-Design, T6, T6 Ocean Race, T6 Platinum, T6 Premier, T6 R-Design, T6 R-Design Platinum | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- XC70 | 2008-2015 | 3.2, T6 | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
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Volvo Oxygen Sensor Part Number: 30774570
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2012 | T5 | 5 Cyl 2.5 L GAS
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Volvo Oxygen Sensor, Driver Side Part Number: 30774651
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- XC90 | 2007-2014 | 3.2, 3.2 R-Design | 6 Cyl 3.2 L GAS
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Volvo Oxygen Sensor Part Number: 30774700
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2011 | T6 | 6 Cyl 3.0 L GAS
- S80 | 2008-2011 | T6 | 6 Cyl 3.0 L GAS
- V60 | 2015 | T6 Polestar, T6 R-Design, T6 R-Design Platinum | 6 Cyl 3.0 L GAS
- XC60 | 2010-2015 | 3.2, 3.2 R-Design, T6, T6 R-Design | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- XC70 | 2009-2010 | T6 | 6 Cyl 3.0 L GAS
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Volvo Oxygen Sensor Part Number: 31319665
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2013-2016 | T5, T5 Inscription Platinum, T5 Inscription Premier, T5 Platinum, T5 Premier, T5 Premier Plus | 5 Cyl 2.5 L GAS
- S60 Cross Country | 2016 | T5 Platinum | 5 Cyl 2.5 L GAS
- V60 | 2015-2016 | T5, T5 Platinum, T5 Premier, T5 Premier Plus | 5 Cyl 2.5 L GAS
- V60 Cross Country | 2015-2016 | T5, T5 Platinum | 5 Cyl 2.5 L GAS
- XC60 | 2015-2016 | T5, T5 Platinum, T5 Premier | 5 Cyl 2.5 L GAS
- XC70 | 2016 | T5, T5 Platinum, T5 Premier | 5 Cyl 2.5 L GAS
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Volvo Oxygen Sensor Part Number: 31439481
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2019-2023 | Recharge R-Design, T5 Inscription, T5 Momentum, T5 R-Design, T6 Inscription, T6 Momentum, T6 R-Design, T8 Inscription, T8 Polestar, T8 R-Design, T8 Recharge Core, T8 Recharge Inscription, T8 Recharge Plus, T8 Recharge Polestar, T8 Recharge R-Design, T8 Recharge R-Design Expression, T8 Recharge Ultimate | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- S90 | 2018-2021 | T6 Inscription, T6 Momentum, T6 R-Design | 4 Cyl 2.0 L GAS
- V60 | 2019-2021 | T5 Inscription, T5 Momentum, T5 R-Design, T6 Inscription, T6 Momentum, T6 R-Design | 4 Cyl 2.0 L GAS
- V60 Cross Country | 2020-2022 | T5 | 4 Cyl 2.0 L GAS
- V90 | 2018-2021 | T5 Inscription, T5 R-Design, T6 Inscription, T6 R-Design | 4 Cyl 2.0 L GAS
- V90 Cross Country | 2017-2021 | T5, T6, T6 Ocean Race | 4 Cyl 2.0 L GAS
- XC60 | 2018-2023 | T6 Inscription, T6 Momentum, T6 R-Design, T8 Recharge Core, T8 Recharge Inscription, T8 Recharge Inscription Expression, T8 Recharge Plus, T8 Recharge Polestar, T8 Recharge R-Design, T8 Recharge Ultimate | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- XC90 | 2016-2023 | T5 Inscription, T5 Momentum, T5 R-Design, T6 First Edition, T6 Inscription, T6 Momentum, T6 R-Design, T8 Recharge Core, T8 Recharge Plus, T8 Recharge Ultimate | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Volvo Oxygen Sensor Part Number: 31439622
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
Fits the following Volvo Models:
- S60 | 2019-2023 | T8 Inscription, T8 Polestar, T8 R-Design, T8 Recharge Inscription, T8 Recharge Polestar, T8 Recharge R-Design, T8 Recharge R-Design Expression | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- S90 | 2018-2022 | B6 Inscription, B6 Momentum, B6 R-Design, T5 Momentum, T6 Inscription, T6 Momentum, T6 R-Design, T8 Inscription, T8 Momentum, T8 R-Design, T8 Recharge Inscription, T8 Recharge R-Design | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- V90 Cross Country | 2018-2019 | T5 | 4 Cyl 2.0 L GAS
- XC60 | 2018-2022 | T5 Inscription, T5 Momentum, T5 R-Design, T8 Inscription, T8 Momentum, T8 Polestar, T8 R-Design, T8 Recharge Inscription, T8 Recharge Inscription Expression, T8 Recharge Polestar, T8 Recharge R-Design | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- XC90 | 2016-2022 | T5 Inscription, T5 Momentum, T5 R-Design, T8 Excellence, T8 Inscription, T8 Momentum, T8 R-Design, T8 Recharge Inscription, T8 Recharge Inscription Expression, T8 Recharge R-Design | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Volvo Oxygen Sensor Part Number: 31480393
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 31368570
Fits the following Volvo Models:
- S60 | 2015-2018 | Polestar, T5, T5 Dynamic, T5 Inscription, T5 Inscription Platinum, T5 Inscription Premier, T5 Platinum, T5 Premier, T5 Premier Plus, T5 R-Design Special Edition, T6, T6 Platinum, T6 Premier Plus, T6 R-Design Platinum | 4 Cyl 2.0 L GAS
- S60 Cross Country | 2017-2018 | T5 | 4 Cyl 2.0 L GAS
- S80 | 2015-2016 | T5, T5 Platinum | 4 Cyl 2.0 L GAS
- V60 | 2015-2017 | Polestar, T5, T5 Platinum, T5 Premier, T5 Premier Plus, T6 R-Design, T6 R-Design Platinum | 4 Cyl 2.0 L GAS
- V60 Cross Country | 2017 | T5, T5 Platinum | 4 Cyl 2.0 L GAS
- XC60 | 2015-2017 | T5, T5 Dynamic, T5 Inscription, T5 Platinum, T5 Premier, T6, T6 Dynamic, T6 Inscription, T6 Ocean Race, T6 Platinum, T6 Premier, T6 R-Design | 4 Cyl 2.0 L GAS
- XC70 | 2015-2016 | T5, T5 Platinum, T5 Premier | 4 Cyl 2.0 L GAS
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Volvo Oxygen Sensor Part Number: 31480395
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 31422307
Fits the following Volvo Models:
- S90 | 2017-2021 | T5 Inscription, T5 Momentum, T6 Inscription, T6 Momentum, T6 R-Design | 4 Cyl 2.0 L GAS
- V90 | 2018 | T6 Inscription, T6 R-Design | 4 Cyl 2.0 L GAS
- V90 Cross Country | 2017-2021 | T6, T6 Ocean Race | 4 Cyl 2.0 L GAS
- XC60 | 2018-2021 | T6 Inscription, T6 Momentum, T6 R-Design | 4 Cyl 2.0 L GAS
- XC90 | 2016-2021 | T5 Inscription, T5 Momentum, T5 R-Design, T6 First Edition, T6 Inscription, T6 Momentum, T6 R-Design | 4 Cyl 2.0 L GAS
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Volvo Oxygen Sensor Part Number: 31480396
$252.65 MSRP: $382.80
You Save: $130.15 (34%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Heated Oxygen Sensor; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 31422308
Fits the following Volvo Models:
- S90 | 2018-2022 | B6 Inscription, B6 Momentum, B6 R-Design, T5 Momentum, T6 Inscription, T6 Momentum, T6 R-Design, T8 Inscription, T8 Momentum, T8 R-Design, T8 Recharge Inscription, T8 Recharge R-Design | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- V90 | 2018-2021 | T5 Inscription, T5 R-Design | 4 Cyl 2.0 L GAS
- V90 Cross Country | 2018-2019 | T5 | 4 Cyl 2.0 L GAS
- XC60 | 2018-2021 | T5 Inscription, T5 Momentum, T5 R-Design, T8 Inscription, T8 Momentum, T8 R-Design | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- XC90 | 2016-2022 | T5 Inscription, T5 Momentum, T5 R-Design, T8 Excellence, T8 Inscription, T8 Momentum, T8 R-Design, T8 Recharge Inscription, T8 Recharge Inscription Expression, T8 Recharge R-Design | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Volvo Oxygen Sensor Parts and Q&A

Oxygen Sensor
3547445
Q: What is the function and operation of the Oxygen Sensor (02S) in vehicle exhaust systems on Volvo 940?
A:
The Oxygen Sensor (02S) produces an electrical voltage in response to oxygen content in exhaust gases, and is generally mounted in the exhaust manifold, and some models have internal heating for faster response. It gives a voltage between 0 and 1 volt, with lower voltages representing lean mixture and higher voltages representing rich mixture, with the ideal fuel to air ratio represented by voltages between 0.4 and 0.6 volts. Later models are equipped with two sensors for tracking the effectiveness of the catalytic converter, one tracking emissions before the converter and the other tracking emissions after the converter, giving the effectiveness of the reduction of emissions. The sensor has a specific temperature that it needs to work, and is in the OPEN LOOP mode until the engine has reached this ideal temperature, then it becomes CLOSED LOOP mode, so that the engine controller can control the air-fuel mixture depending on readings from the sensor. A Heated Oxygen Sensor (H02S) ensures optimal temperature for faster CLOSED LOOP operation where the engine controller uses information from the sensor to adjust the injector pulse width, while in OPEN LOOP the engine controller uses preprogrammed values. For testing, the H02S is disconnected and supply voltage to the heating element is checked, followed by resistance checks and continuity tests for proper function. Removing the battery by disconnecting the battery, jacking the vehicle up, carefully remove the sensor with suitable tooling, installing the sensor includes applying anti-seize compound and tightening to specified torque before reconnecting the wiring harness and lowering the vehicle.