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Audi Oxygen Sensors
54 itemsShop best-selling oxygen sensors for Ford, Chevy, Honda, Nissan, Toyota, and more. Direct-fit O2 sensors with fast response, improved MPG, and reliable emissions performance.
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A-Premium®Part # APOS0039
1-Pc O2 Oxygen Sensor A-Premium APOS0039
4.644 Reviews
CA$40.99
CA$45.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1997 - 1998 Aston Martin DB7, 1996 - 1997 Audi S6, 1994 - 1994 Jaguar XJ12, 1994 - 1994 Jaguar XJS, 1994 - 1994 Jaguar XJS, 1993 - 1993 Jaguar XJRS, 1993 - 1993 Jaguar XJS, 1992 - 1994 Jaguar Vanden Plas, 1992 - 1994 Jaguar XJ6, 1991 - 1993 Volvo 940, 1991 - 1992 Yugo Cabrio, 1991 - 1992 Yugo GV, 1989 - 1991 Volvo 780, 1988 - 1988 Alfa Romeo Milano, 1988 - 1988 Alfa Romeo Milano, 1986 - 1987 Volvo 244, 1986 - 1987 Volvo 245, 1985 - 1992 Volvo 740, 1985 - 1990 Volvo 760, 1985 - 1987 Audi 4000
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Vehicle: Audi
Installation PositionCheck the fitment chart
Item LocatedCanada
ConditionNew
item #10030AGU
Note
【Note-1】For 740 & 745 & 940, this item fits Turbocharged, not fit Naturally Aspirated.
【Note-2】For L6 4.0L 1993-1994 XJS, this item fits Cylinder 1-3/4-6.
【Note-2】For L6 4.0L 1993-1994 XJS, this item fits Cylinder 1-3/4-6.
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A-Premium®Part # APOS1855
1-Pc O2 Oxygen Sensor A-Premium APOS1855
4.644 Reviews
CA$48.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1996 - 1997 Audi A6, 1995 - 1997 Audi A6 Quattro, 1995 - 1995 Audi A6, 1994 - 1998 Audi Cabriolet, 1994 - 1995 Audi 90 Quattro, 1994 - 1994 Audi 100, 1994 - 1994 Audi 100 Quattro, 1993 - 1995 Audi 90, 1993 - 1993 Audi 100, 1993 - 1993 Audi 100 Quattro, 1993 - 1993 Audi 90 Quattro, 1988 - 1988 Ferrari Mondial 3.2, 1988 - 1988 Saab 900, 1988 - 1988 Volvo 244, 1988 - 1988 Volvo 245, 1987 - 1989 Saab 9000, 1986 - 1989 Ferrari 328 GTS, 1985 - 1988 Volvo 740, 1985 - 1986 Volvo 740, 1985 - 1985 Volvo 244
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Vehicle: Audi
Installation PositionCheck the fitment chart
Item LocatedCanada
ConditionNew
item #10026A8Q
Note
O2 Sensor - Bank 1 Sensor 1 (B1S1).
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A-Premium®Part # APOS0632
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | A-Premium APOS0632
4.644 Reviews
CA$104.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2022 - 2022 Audi A3, 2022 - 2022 Audi A3 Quattro, 2022 - 2022 Audi S3, 2020 - 2022 Volkswagen Atlas Cross Sport, 2020 - 2020 Audi A3, 2018 - 2022 Volkswagen Atlas, 2018 - 2022 Volkswagen Tiguan, 2018 - 2018 Volkswagen GTI, 2017 - 2018 Audi A3, 2017 - 2017 Volkswagen GTI, 2016 - 2018 Audi TT Quattro, 2016 - 2018 Audi TTS Quattro, 2015 - 2019 Audi A3 Quattro, 2015 - 2018 Audi S3, 2015 - 2018 Volkswagen Golf R, 2015 - 2016 Volkswagen GTI
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Vehicle: Audi
Quantity1
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #10032GS2
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A-Premium®Part # APOS0397
Upstream O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS0397
4.644 Reviews
CA$88.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2002 - 2003 Audi S6, 2001 - 2001 Audi Allroad Quattro, 2000 - 2005 Volkswagen Passat, 2000 - 2004 Audi A6 Quattro, 2000 - 2002 Audi S4, 2000 - 2001 Audi A4, 2000 - 2001 Audi A4 Quattro, 2000 - 2001 Audi A6, 2000 - 2001 Audi A6 Quattro, 2000 - 2001 Audi A6 Quattro
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Vehicle: Audi
Quantity2
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #10049W6P
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A-Premium®Part # APOS0522
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0522
4.644 Reviews
CA$60.99
CA$63.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2007 - 2007 Audi S6
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Vehicle: Audi
Quantity1
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #100323KW
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A-Premium®Part # APOS2035
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS2035
4.644 Reviews
CA$163.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2019 - 2020 Audi A4 allroad, 2019 - 2020 Audi A4 Quattro, 2019 - 2020 Audi A5 Sportback, 2018 - 2020 Audi A5 Quattro, 2018 - 2018 Audi A4 Quattro, 2018 - 2018 Audi Q5, 2017 - 2019 Audi Q7, 2015 - 2015 Bentley Continental, 2014 - 2014 Volkswagen Beetle, 2014 - 2014 Volkswagen Jetta, 2014 - 2014 Volkswagen Passat, 2013 - 2016 Audi Q5
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Vehicle: Audi
Installation PositionUpstream
Item LocatedUnited States
ConditionNew
item #101883CA
Note
The shape of the sensing element does not affect its performance.
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A-Premium®Part # APOS1872
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS1872
4.644 Reviews
CA$63.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2018 - 2018 Audi A8 Quattro, 2018 - 2018 Audi RS7, 2018 - 2018 Audi S6, 2018 - 2018 Audi S7, 2018 - 2018 Volkswagen Jetta, 2016 - 2018 Audi S8, 2016 - 2017 Audi A8 Quattro, 2016 - 2017 Audi RS7, 2016 - 2017 Audi S6, 2016 - 2017 Audi S7, 2015 - 2017 Volkswagen Passat, 2015 - 2015 Bentley Continental, 2014 - 2017 Volkswagen Beetle, 2014 - 2017 Volkswagen Jetta, 2014 - 2015 Audi RS7, 2013 - 2015 Audi A8 Quattro, 2013 - 2015 Audi S6, 2013 - 2015 Audi S7, 2013 - 2015 Audi S8
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Vehicle: Audi
Quantity1
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #1000U11V
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A-Premium®Part # APOS0437
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0437
4.644 Reviews
CA$66.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2024 - 2024 Hyundai Elantra, 2022 - 2023 Hyundai Elantra, 2022 - 2022 Hyundai Ioniq, 2021 - 2022 Kia Niro, 2021 - 2021 Hyundai Elantra, 2018 - 2019 Hyundai Accent, 2018 - 2019 Kia Rio, 2017 - 2021 Hyundai Ioniq, 2017 - 2020 Kia Niro, 2017 - 2019 Audi Q7, 2017 - 2019 Kia Soul, 2017 - 2018 Audi A7 Quattro, 2017 - 2018 Audi A8 Quattro, 2016 - 2018 Audi A3 Sportback e-tron, 2016 - 2016 Fiat 500L, 2015 - 2018 Audi A6 Quattro, 2015 - 2017 Audi Q5, 2015 - 2017 Audi S5, 2015 - 2017 Audi SQ5, 2015 - 2017 Fiat 500
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Vehicle: Audi
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #100323QG
Note
Oxygen Senor - B1S1 Indicates Bank 1 Sensor 1. B2S1 Indicates Bank 2 Sensor 1.
【Note-1】For 2011 Hyundai Sonata L4 2.0L, it fits the model built To 01/25/2011.
【Note-2】For 2009 Hyundai Elantra, it fits the model built From 04/03/2009.
【Note-3】For 2010 Hyundai Elantra, it fits Sedan only, not Hatchback.
【Note-1】For 2011 Hyundai Sonata L4 2.0L, it fits the model built To 01/25/2011.
【Note-2】For 2009 Hyundai Elantra, it fits the model built From 04/03/2009.
【Note-3】For 2010 Hyundai Elantra, it fits Sedan only, not Hatchback.
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A-Premium®Part # APOS0720
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0720
4.644 Reviews
CA$77.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2020 - 2021 Ford Escape, 2008 - 2009 Audi A8 Quattro
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Vehicle: Audi
Quantity1
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #100321A2
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A-Premium®Part # APOS0619
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0619
4.644 Reviews
CA$84.99
CA$89.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2021 - 2022 Audi Q7, 2019 - 2020 Audi A4 allroad, 2019 - 2020 Audi A4 Quattro, 2019 - 2020 Audi A5 Sportback, 2018 - 2020 Audi A5 Quattro, 2018 - 2018 Audi A4 Quattro, 2018 - 2018 Audi Q5, 2017 - 2019 Audi Q7, 2015 - 2015 Bentley Continental, 2014 - 2014 Volkswagen Beetle, 2014 - 2014 Volkswagen Jetta, 2014 - 2014 Volkswagen Passat, 2013 - 2016 Audi Q5
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Vehicle: Audi
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #10032GP5
Note
【Note-1】For 2019-2020 Audi A4 allroad & A4 Quattro models built From 03/29/2019.
【Note-2】For 2013-2016 Audi Q5 FULL HYBRID EV-GAS (FHEV) models, Not for GAS or FLEX or DIESEL.
【Note-3】For 2015 Bentley Continental models with Cylinder 5,6,7,8, Not for Cylinder 1,2,3,4.
【Note-4】For 2014 Volkswagen Beetle models built To 06/29/2014.
【Note-2】For 2013-2016 Audi Q5 FULL HYBRID EV-GAS (FHEV) models, Not for GAS or FLEX or DIESEL.
【Note-3】For 2015 Bentley Continental models with Cylinder 5,6,7,8, Not for Cylinder 1,2,3,4.
【Note-4】For 2014 Volkswagen Beetle models built To 06/29/2014.
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A-Premium®Part # OS051
Downstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium OS051
4.644 Reviews
CA$40.99
CA$45.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2015 - 2015 Audi RS5, 2014 - 2014 Audi RS5, 2013 - 2013 Audi RS5, 2010 - 2011 Volkswagen Golf, 2008 - 2011 Audi S5, 2008 - 2009 Volkswagen Jetta, 2008 - 2009 Volkswagen Rabbit, 2007 - 2011 Audi S6, 2007 - 2009 Audi S8, 2006 - 2007 Volkswagen Rabbit, 2005 - 2007 Volkswagen Jetta
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Vehicle: Audi
Installation PositionDownstream
Item LocatedCanada
ConditionNew
item #10031KD7
Note
【Note-1】The overall length is 470 mm, not 520 mm.
Vehicle Note: For S6 fits with Cylinder 1-3, not fit Cylinder 4,5, Cylinder 6-8.
【Note-2】For S8 fits with Cylinder 6-8, Cylinder 9,10, not fit Cylinder 1-3, Cylinder 4,5.
Vehicle Note: For S6 fits with Cylinder 1-3, not fit Cylinder 4,5, Cylinder 6-8.
【Note-2】For S8 fits with Cylinder 6-8, Cylinder 9,10, not fit Cylinder 1-3, Cylinder 4,5.
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A-Premium®Part # APOS0753
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0753
4.644 Reviews
CA$84.99
CA$89.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2022 - 2024 Volkswagen Tiguan, 2022 - 2023 Volkswagen Atlas, 2022 - 2023 Volkswagen Atlas Cross Sport, 2022 - 2022 Audi Q3, 2020 - 2021 Volkswagen Tiguan, 2019 - 2019 Volkswagen Tiguan, 2018 - 2020 Audi A3, 2018 - 2018 Audi A3 Quattro, 2018 - 2018 Audi S3
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Audi
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #10032C1Y
Note
Oxygen Senor - B1S1 Indicates Bank 1 Sensor 1.
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A-Premium®Part # APOS0630
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0630
4.644 Reviews
CA$69.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2019 - 2019 Audi Q7, 2019 - 2019 Audi Q7, 2019 - 2019 Audi Q7, 2019 - 2019 Audi Q7, 2019 - 2019 Audi Q7, 2019 - 2019 Audi Q7, 2019 - 2019 Kia Soul, 2019 - 2019 Kia Soul, 2018 - 2019 Hyundai Accent, 2018 - 2019 Kia Rio, 2017 - 2018 Audi Q7, 2017 - 2017 Kia Rio, 2016 - 2018 Audi A3 Sportback e-tron, 2016 - 2018 Audi A6 Quattro, 2016 - 2018 Audi A7 Quattro, 2015 - 2018 Audi A8 Quattro
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Vehicle: Audi
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #10032DXK
Note
【Note-1】 For 2017 Kia Rio, it only fits for Vehicles Built in Mexico.
【Note-2】 For 2019 Kia Soul, it fits for Naturally Aspirated, not Turbocharged.
【Note-2】 For 2019 Kia Soul, it fits for Naturally Aspirated, not Turbocharged.
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A-Premium®Part # APOS1966
Downstream Driver & Passenger O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS1966
4.644 Reviews
CA$92.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1995 - 1998 Audi Cabriolet, 1994 - 1994 Audi Cabriolet
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Vehicle: Audi
Quantity2
Installation PositionDownstream Driver & Passenger
Item LocatedCanada
ConditionNew
item #1004A7PZ
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A-Premium®Part # APOS0418
Downstream O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS0418
4.644 Reviews
CA$86.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2015 - 2017 Audi Q5, 2015 - 2017 Audi S5, 2015 - 2017 Audi SQ5, 2015 - 2016 Audi S4, 2015 - 2015 Audi A6 Quattro, 2015 - 2015 Audi A7 Quattro, 2014 - 2014 Audi SQ5, 2013 - 2014 Audi A8 Quattro, 2012 - 2014 Audi A6 Quattro, 2012 - 2014 Audi A7 Quattro, 2010 - 2014 Audi S4, 2010 - 2014 Audi S5, 2009 - 2014 Audi Q5, 2009 - 2009 Audi A4 Quattro, 2008 - 2010 Audi A5 Quattro
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Vehicle: Audi
Installation PositionDownstream
Item LocatedCanada
ConditionNew
item #10049VL5
Note
Oxygen Senor - B1S2 Indicates Bank 1 Sensor 2, B2S2 Indicates Bank 2 Sensor 2.
For Audi 2012-2015 A6 Quattro & A7 Quattro & 2013-2014 A8 Quattro & 2009-2017 Audi Q5, it fits GAS only, not fit with DIESEL.
For Audi 2012-2015 A6 Quattro & A7 Quattro & 2013-2014 A8 Quattro & 2009-2017 Audi Q5, it fits GAS only, not fit with DIESEL.
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A-Premium®Part # APOS0618
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0618
4.644 Reviews
CA$84.99
CA$89.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2018 - 2018 Audi A8 Quattro, 2018 - 2018 Audi RS7, 2018 - 2018 Audi S6, 2018 - 2018 Audi S7, 2016 - 2018 Audi S8, 2016 - 2017 Audi A8 Quattro, 2016 - 2017 Audi RS7, 2016 - 2017 Audi S6, 2016 - 2017 Audi S7, 2014 - 2015 Audi RS7, 2013 - 2015 Audi A8 Quattro, 2013 - 2015 Audi S6, 2013 - 2015 Audi S7, 2013 - 2015 Audi S8
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Vehicle: Audi
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #10032DPX
Note
The models suitable for Cylinders 1, 2, 3, 4 are not suitable for Cylinders 5, 6, 7, 8.
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A-Premium®Part # OS060
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium OS060
4.644 Reviews
CA$40.99
CA$45.99Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2002 - 2003 Audi S6, 2001 - 2001 Audi Allroad Quattro, 2000 - 2005 Volkswagen Passat, 2000 - 2004 Audi A6 Quattro, 2000 - 2002 Audi S4, 2000 - 2001 Audi A4, 2000 - 2001 Audi A4 Quattro, 2000 - 2001 Audi A6, 2000 - 2001 Audi A6 Quattro, 2000 - 2001 Audi A6 Quattro
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Audi
Quantity1
Installation PositionUpstream
Item LocatedCanada
ConditionNew
item #100312A7
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A-Premium®Part # APOS0416
Upstream & Downstream O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS0416
4.644 Reviews
CA$89.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2000 - 2000 Audi A4 Quattro, 1999 - 2000 Volkswagen Eurovan, 1998 - 1999 Audi A4, 1998 - 1999 Audi A4 Quattro, 1998 - 1999 Volkswagen Passat, 1997 - 1999 Audi A4 Quattro, 1997 - 1997 Volkswagen Eurovan
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Vehicle: Audi
Quantity2
Installation PositionUpstream & Downstream
Item LocatedCanada
ConditionNew
item #10049GHH
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A-Premium®Part # APOS1022
Upstream Driver & Passenger O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS1022
4.644 Reviews
CA$129.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2017 - 2019 Audi Q7, 2017 - 2018 Audi A7 Quattro, 2017 - 2018 Audi A8 Quattro, 2015 - 2018 Audi A6 Quattro, 2015 - 2017 Audi Q5, 2015 - 2017 Audi S5, 2015 - 2017 Audi SQ5, 2015 - 2016 Audi A7 Quattro, 2015 - 2016 Audi A8 Quattro, 2015 - 2016 Audi S4, 2014 - 2014 Audi A7 Quattro, 2014 - 2014 Audi SQ5, 2013 - 2014 Audi Q5, 2012 - 2013 Audi A7 Quattro, 2010 - 2013 Audi S4, 2010 - 2013 Audi S5, 2009 - 2014 Audi A6 Quattro, 2009 - 2012 Audi Q5, 2008 - 2010 Audi A5 Quattro, 2006 - 2011 Audi A6
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Audi
Installation PositionUpstream Driver & Passenger
Item LocatedCanada
ConditionNew
item #1001H438
Note
Oxygen Sensor - B1S1 Indicates Bank 1 Sensor 1, B2S1 Indicates Bank 2 Sensor 1.
【Note-1】For Audi 2014-2016 A7 Quattro & 2015-2016 A8 Quattro, it fits GAS, not DIESEL.
【Note-2】For Audi 2013-2014 Q5 & 2017-2019 Q7, it fits GAS, not DIESEL.
【Note-1】For Audi 2014-2016 A7 Quattro & 2015-2016 A8 Quattro, it fits GAS, not DIESEL.
【Note-2】For Audi 2013-2014 Q5 & 2017-2019 Q7, it fits GAS, not DIESEL.
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A-Premium®Part # APOS1997
Downstream Driver & Passenger O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS1997
4.644 Reviews
CA$88.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2015 - 2015 Audi RS5, 2014 - 2014 Audi RS5, 2013 - 2013 Audi RS5, 2008 - 2011 Audi S5
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Audi
Quantity2
Installation PositionDownstream Driver & Passenger
Item LocatedCanada
ConditionNew
item #1004A9N6
Show less
Your vehicle’s oxygen sensor (also known as O2 sensors) plays a critical role in engine performance, fuel efficiency, and emissions control. By continuously measuring the amount of unburned oxygen in the exhaust, the oxygen sensor sends real-time feedback to your engine control unit (ECU), ensuring the perfect air-fuel mixture.
When an oxygen sensor fails, your engine essentially runs “blind,” leading to poor fuel economy, rough idling, reduced performance, and a persistent check engine light. A timely front oxygen sensor replacement or replacement of a faulty upstream oxygen sensor or downstream oxygen sensor can restore optimal driving conditions and help you pass emissions tests with ease.
Why Choose A-Premium Oxygen Sensors?
Unlike universal parts that require cutting and splicing wires, A-Premium O2 sensors are engineered for direct plug-and-play installation.
- OEM-style connectors for seamless fit
- Pre-coated anti-seize threads for easy installation
- Laser-welded body construction for durability
- High-temperature sintered coating for long service life
- Premium insulation sheathing and impact-resistant design
- Slotted guard tube for sensor protection
- High heat dissipation structure for extreme environments
Advanced Performance & Precision
A-Premium oxygen sensor technology ensures fast, accurate, and stable performance:
Performance & Response
- ≤200ms fast response time
- High-efficiency oxygen sensing
- Zirconia sensing element
- Real-time signal feedback
Precision & Control
- Real-time exhaust tracking
- Accurate combustion control
- Stable signal output
Efficiency & Engine Benefits
- Improved fuel efficiency
- Enhanced engine performance
- Reduced harmful emissions
- Extended engine lifespan
Environmental Adaptability
- Operating range: -40°F to 266°F
- Air-tight sealing design
- Stable performance under harsh conditions
3 Symptoms of a Bad Oxygen Sensor
Because O2 sensors operate in extreme heat and carbon-rich environments, they naturally degrade over time.
- Check Engine Light (CEL): Common codes include P0135, P0171, and P0420. These often point to issues with an upstream oxygen sensor or oxygen sensor bank 1.
- Poor Fuel Economy: A faulty oxygen sensor may cause a rich fuel mixture, dramatically lowering MPG. 20-40% worse fuel economy overnight.
- Rough Idle & Stalling: Incorrect readings from your downstream oxygen sensor or upstream sensor can disrupt engine stability.
- Rotten egg smell: Catalytic converter overheating from bad fuel mixture
Understanding O2 Sensor Positions: Upstream vs Downstream
Modern vehicles may have multiple oxygen sensor units, making it essential to identify the correct one:
- Oxygen Sensor Bank 1vs Bank 2
- oxygen sensor bank 1 refers to the side of the engine with Cylinder #1
- Bank 2 is the opposite side
- Upstream Oxygen Sensor(Sensor 1)
- Located before the catalytic converter
- Controls air-fuel ratio
- Most common need for front oxygen sensor replacement
- Downstream Oxygen Sensor(Sensor 2)
- Located after the catalytic converter
- Monitors emissions system efficiency
Tip: Always match your diagnostic code to the correct upstream oxygen sensor or downstream oxygen sensor before purchasing.
Complete Your Emissions Repair
Replacing your oxygen sensor is often part of a larger emissions system fix. Consider inspecting these related components:
- Catalytic Converter: Persistent issues after replacing a downstream oxygen sensor may indicate converter failure
- MAF Sensor: Works with your oxygen sensor to calculate air intake
- Ignition Coils & Spark Plugs: Misfires can damage O2 sensors quickly
Shop by Popular Makes
To help you quickly find the right oxygen sensor, explore our most popular vehicle-specific options:
Browse our most searched and best-selling vehicle-specific oxygen sensor options to quickly locate the right fit for your car.
Popular Models under Audi
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Frequently Asked Questions
Can I clean my oxygen sensor instead of replacing it?
Should I replace O2 sensors in pairs?
Do I need a special tool?
How long do oxygen sensors last?
What’s the difference between upstream and downstream sensors?
What happens if I ignore a bad oxygen sensor?
How do I know if it’s Bank 1 or Bank 2?
Will replacing an oxygen sensor improve MPG?
How do oxygen sensor voltages relate to fuel mixture?
How much does it cost to replace an oxygen sensor?
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P0175 Code: System Too Rich (Bank 2) What to Check and Fix
Diagnose P0175 (System Too Rich, Bank 2) by comparing fuel trims. Isolate Bank 2 injector or sensor faults versus shared MAF, pressure, or purge issues. Follow our step-by-step guide to fix it safely and avoid unnecessary part replacements.
Nov 02, 2026
P0139 Code: Bank 1 Sensor 2 Slow Response & Fixes
Fix P0139 (Bank 1 Sensor 2 Slow Response) by checking wiring, exhaust leaks, and heater circuits before replacing the sensor. Learn step-by-step diagnosis, proper part selection, and why this code doesn't always mean a bad catalytic converter.
Oct 28, 2026
P0134 Code: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
Fix P0134 (O2 Sensor Circuit No Activity) by inspecting wiring, testing heater circuits, and verifying sensor data before replacing parts. Avoid misdiagnosis with this step-by-step guide to restore fuel efficiency and ensure accurate repairs.
Oct 28, 2026
Best O2 Sensor Brands: Choose the Right Replacement
Compare top O2 sensor brands like A-Premium, DENSO, NTK, and Bosch. Learn to verify fitment, distinguish upstream/downstream sensors, and avoid common buying mistakes for a reliable, cost-effective replacement.
Oct 14, 2026
Why Is My Car Running Worse After a New O2 Sensor?
Car running worse after O2 sensor replacement? Check part compatibility, wiring, and exhaust leaks before assuming a bad sensor. Learn to diagnose fuel trims, verify installation, and avoid costly mistakes with this step-by-step guide.
Oct 13, 2026