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2009 Ford Focus Oxygen Sensors
49 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 # APOS0095
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | A-Premium APOS0095
4.5675 Reviews
$32.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010 - 2013 Ford Transit Connect, 2010 - 2013 Ford Transit Connect, 2008 - 2011 Ford Focus, 2008 - 2010 Ford Focus
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Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
ConditionNew
item #10031QNQ
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A-Premium®Part # APOS2140
Downstream or Downstream Passenger Side O2 Oxygen Sensor | 1-Pc Direct-Fit | A-Premium APOS2140
4.5675 Reviews
$26.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2013 - 2013 Ford E-350 Super Duty, 2011 - 2015 Ford F-53 Motorhome Chassis, 2011 - 2011 Ford F-250 Super Duty, 2010 - 2010 Ford F-150, 2009 - 2010 Ford F-150, 2009 - 2010 Ford F-150, 2007 - 2010 Ford Explorer Sport Trac, 2006 - 2016 Ford E-450 Super Duty, 2006 - 2009 Ford F-53 Motorhome Chassis, 2005 - 2007 Ford Five Hundred, 2005 - 2007 Ford Freestyle, 2004 - 2007 Ford Freestar, 2004 - 2004 Ford F-150 Heritage, 2003 - 2015 Ford E-450 Super Duty, 2003 - 2014 Ford E-150, 2003 - 2014 Ford E-150, 2003 - 2014 Ford E-250, 2003 - 2014 Ford E-250, 2003 - 2005 Ford E-150 Club Wagon, 2003 - 2004 Ford E-450 Super Duty
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Vehicle: 2009 Ford Focus
Quantity1
Installation PositionDownstream or Downstream Passenger Side
Item LocatedUnited States
ConditionNew
item #10192SW1
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A-Premium®Part # APOS0885
Upstream & Downstream O2 Oxygen Sensor | 2-Pc Direct-Fit | Heated | A-Premium APOS0885
4.5675 Reviews
$58.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2008 - 2011 Ford Focus
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Vehicle: 2009 Ford Focus
Installation PositionUpstream & Downstream
Item LocatedUnited States
ConditionNew
item #1001GUKD
Note
Oxygen Sensor - Upstream(Bank 1 Sensor 1) and Downstream(Bank 1 Sensor 2).
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A-Premium®Part # OS036
O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium OS036
4.5675 Reviews
$28.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2006 - 2011 Lincoln Town Car, 2006 - 2011 Mercury Grand Marquis, 2005 - 2007 Ford Five Hundred, 2005 - 2007 Ford Freestyle, 2005 - 2007 Mercury Montego, 2005 - 2006 Ford GT, 2005 - 2006 Mercury Mariner, 2004 - 2004 Ford E-150, 2003 - 2005 Ford E-150, 2003 - 2004 Ford E-150 Club Wagon, 2003 - 2004 Ford E-150 Club Wagon, 2003 - 2004 Ford E-250, 2003 - 2004 Ford E-250, 2003 - 2004 Ford E-350 Club Wagon, 2003 - 2004 Ford E-350 Club Wagon, 2003 - 2004 Ford E-450 Super Duty, 2003 - 2004 Ford E-450 Super Duty, 2003 - 2004 Mercury Marauder, 2003 - 2003 Ford E-550 Super Duty, 2003 - 2003 Ford Escort
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Vehicle: 2009 Ford Focus
Installation PositionCheck the fitment chart
Item LocatedUnited States
ConditionNew
item #10030XPK
Note
O2 Sensor - B1S1 Indicates Bank 1 Sensor 1, B2S1 Indicates Bank 2 Sensor 1.
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A-Premium®Part # OS031
O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium OS031
4.5675 Reviews
$28.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2015 - 2015 Ford E-350 Super Duty, 2015 - 2015 Ford E-450 Super Duty, 2013 - 2014 Ford E-350 Super Duty, 2012 - 2015 Ford F-53 Motorhome Chassis, 2012 - 2015 Ford F-59 Commercial Stripped Chassis, 2011 - 2014 Ford E-450 Super Duty, 2011 - 2011 Ford Ranger, 2010 - 2012 Ford F-450 Super Duty, 2010 - 2010 Ford Explorer, 2010 - 2010 Ford F-150, 2010 - 2010 Ford Flex, 2010 - 2010 Ford Fusion, 2010 - 2010 Lincoln MKT, 2010 - 2010 Mercury Milan, 2009 - 2014 Lincoln MKS, 2009 - 2010 Ford F-150, 2009 - 2010 Ford Flex, 2009 - 2010 Mazda 6, 2009 - 2010 Mazda Tribute, 2009 - 2010 Mercury Mariner
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Vehicle: 2009 Ford Focus
Quantity1
Installation PositionCheck the fitment chart
Item LocatedUnited States
ConditionNew
item #1003068D
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A-Premium®Part # APOS0075
O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0075
4.5675 Reviews
$27.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2008 - 2011 Ford Focus, 2005 - 2007 Ford Focus, 2003 - 2007 Ford Focus
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Vehicle: 2009 Ford Focus
Installation PositionCheck the fitment chart
Item LocatedUnited States
ConditionNew
item #10031K36
Note
Oxygen Senor - B1S2 Indicates Bank 1 Sensor 2.
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A-Premium®Part # APOS0005
O2 Oxygen Sensor | 1-Pc Direct-Fit | Heated | A-Premium APOS0005
4.5675 Reviews
$85.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2024 - 2024 Ford Explorer, 2024 - 2024 Ford Police Interceptor Utility, 2024 - 2024 Lincoln Aviator, 2023 - 2024 Ford Edge, 2023 - 2023 Lincoln Nautilus, 2022 - 2023 Ford Explorer, 2022 - 2023 Ford Mustang, 2022 - 2023 Ford Police Interceptor Utility, 2022 - 2023 Lincoln Aviator, 2022 - 2022 Ford GT, 2022 - 2022 Lincoln Nautilus, 2022 - 2022 Lincoln Nautilus, 2021 - 2021 Ford F-150, 2020 - 2021 Ford Explorer, 2020 - 2021 Ford GT, 2020 - 2021 Ford Police Interceptor Utility, 2020 - 2021 Ford Transit-150, 2020 - 2021 Ford Transit-250, 2020 - 2021 Ford Transit-350, 2020 - 2021 Ford Transit-350 HD
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Vehicle: 2009 Ford Focus
Installation PositionCheck the fitment chart
Item LocatedUnited States
ConditionNew
item #1003236D
Note
For 2022-2024 Police Interceptor Utility & Aviator fits the model built To 05/13/2024.
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AisinPart # OXSAZ-00397
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Aisin OXSAZ-00397
4.5675 Reviews
$100.99
Low stock: Only 2 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2024 - 2024 Ford Explorer, 2023 - 2024 Ford Edge, 2022 - 2022 Ford Edge, 2020 - 2024 Ford Police Interceptor Utility, 2020 - 2024 Lincoln Aviator, 2020 - 2023 Ford Explorer, 2020 - 2021 Ford Transit-150, 2020 - 2021 Ford Transit-250, 2020 - 2021 Ford Transit-350, 2020 - 2021 Ford Transit-350 HD, 2019 - 2023 Lincoln Nautilus, 2019 - 2022 Lincoln Nautilus, 2018 - 2021 Ford Expedition, 2018 - 2021 Lincoln Navigator, 2017 - 2022 Ford GT, 2017 - 2021 Ford Escape, 2017 - 2021 Ford F-150, 2017 - 2020 Ford F-250 Super Duty, 2017 - 2020 Ford F-350 Super Duty, 2017 - 2020 Ford Fusion
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
ConditionNew
item #1018PL22
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AisinPart # OXSAZ-00457
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Aisin OXSAZ-00457
4.5675 Reviews
$43.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2005 - 2007 Ford Five Hundred, 2005 - 2007 Ford Freestyle, 2005 - 2007 Mercury Montego, 2005 - 2006 Ford GT, 2005 - 2006 Mercury Mariner, 2004 - 2004 Ford E-150, 2003 - 2005 Ford E-150, 2003 - 2004 Ford E-150 Club Wagon, 2003 - 2004 Ford E-150 Club Wagon, 2003 - 2004 Ford E-250, 2003 - 2004 Ford E-350 Club Wagon, 2003 - 2004 Ford E-350 Club Wagon, 2003 - 2004 Ford E-450 Super Duty, 2003 - 2004 Mercury Marauder, 2003 - 2003 Ford E-550 Super Duty, 2002 - 2002 Ford E-550 Econoline Super Duty, 2001 - 2006 Ford Escape, 2001 - 2004 Ford Escape, 2001 - 2004 Mazda Tribute, 2001 - 2004 Mazda Tribute
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
ConditionNew
item #1018EE2P
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AisinPart # OXSFD-00437
Upstream O2 Oxygen Sensor | 2-Pc Direct-Fit | Aisin OXSFD-00437
4.5675 Reviews
$75.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010 - 2013 Ford Transit Connect, 2008 - 2011 Ford Focus
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Vehicle: 2009 Ford Focus
Quantity2
Installation PositionUpstream
Item LocatedUnited States
ConditionNew
item #1018EETU
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AisinPart # OXSFD-00436
Upstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Aisin OXSFD-00436
4.5675 Reviews
$43.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010 - 2013 Ford Transit Connect, 2008 - 2011 Ford Focus
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
ConditionNew
item #1018EGC4
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AisinPart # OXSAZ-00440
Upstream or Downstream O2 Oxygen Sensor | 1-Pc Direct-Fit | Aisin OXSAZ-00440
4.5675 Reviews
$43.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2012 - 2015 Ford F-53 Motorhome Chassis, 2011 - 2011 Ford F-250 Super Duty, 2011 - 2011 Ford F-350 Super Duty, 2011 - 2011 Ford Ranger, 2010 - 2014 Lincoln MKS, 2010 - 2012 Ford F-450 Super Duty, 2010 - 2010 Ford Explorer, 2010 - 2010 Ford F-150, 2010 - 2010 Ford Fusion, 2010 - 2010 Ford Fusion, 2010 - 2010 Lincoln MKT, 2010 - 2010 Lincoln MKT, 2009 - 2010 Ford Escape, 2009 - 2010 Ford F-150, 2009 - 2010 Lincoln MKS, 2009 - 2010 Mazda 6, 2009 - 2010 Mazda Tribute, 2008 - 2010 Ford Fusion, 2008 - 2010 Ford Taurus, 2008 - 2010 Mazda CX-9
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Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream or Downstream
Item LocatedUnited States
ConditionNew
item #1018EC68
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AisinPart # OXSFD-00394
Downstream or Center O2 Oxygen Sensor | 1-Pc Direct-Fit | Aisin OXSFD-00394
4.5675 Reviews
$43.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2008 - 2011 Ford Focus, 2005 - 2007 Ford Focus, 2003 - 2007 Ford Focus
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Installation PositionDownstream or Center
Item LocatedUnited States
ConditionNew
item #1018EPTL
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BoschPart # 18029
Oxygen Sensor - Upstream - Bosch 18029
46 Reviews
$119.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010-2013 Ford Transit Connect, 2009-2011 Ford Focus, 2008-2011 Ford Focus, 2008-2011 Ford Focus, 2008-2011 Ford Focus
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Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
Part interchange
18029
item #1002EDYP
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Spectra PremiumPart # OS5037
Spectra Premium OS5037 Oxygen Sensor
4.45 Reviews
$34.99
Low stock: Only 1 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2015-2016 Ford E-350 Super Duty, 2015-2015 Ford E-350 Super Duty, 2014-2015 Lincoln MKS, 2014-2014 Ford E-150, 2014-2014 Ford E-150, 2014-2014 Ford E-250, 2014-2014 Ford E-250, 2014-2014 Ford E-350 Super Duty, 2014-2014 Ford E-350 Super Duty, 2014-2014 Ford E-350 Super Duty, 2014-2014 Ford E-350 Super Duty, 2013-2013 Ford E-250, 2013-2013 Ford E-250, 2013-2013 Ford E-350 Super Duty, 2013-2013 Ford E-350 Super Duty, 2013-2013 Ford E-350 Super Duty, 2013-2013 Ford E-350 Super Duty, 2012-2013 Ford E-150, 2012-2013 Ford E-250, 2012-2013 Lincoln MKS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Item LocatedUnited States
Part interchange
OS5037, 751521, 751582, 751650, 751721, 752124, 752546, 752795,
...View moreitem #1000YE2P
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DensoPart # 234-4210
Denso 234-4210 Oxygen Sensor
4.29 Reviews
$58.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2011-2015 Lincoln MKS, 2010-2010 Ford Fusion, 2010-2010 Ford Fusion, 2010-2010 Ford Fusion, 2010-2010 Lincoln MKT, 2009-2010 Ford Flex, 2009-2010 Lincoln MKS, 2009-2010 Mazda 6, 2008-2011 Mazda Tribute, 2008-2009 Ford Taurus X, 2008-2009 Mercury Sable, 2007-2010 Ford Edge, 2007-2010 Lincoln MKX, 2007-2010 Lincoln MKZ, 2007-2010 Mazda CX-9, 2006-2010 Ford Taurus, 2006-2010 INFINITI M45, 2006-2010 Mercury Milan, 2006-2009 Ford Fusion, 2006-2008 Mazda 6
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Item LocatedUnited States
Part interchange
234-4210, 15718, 13316, 15657, 13131, 15001, 13123, 15214,
...View moreitem #1004Z0C9
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DensoPart # 234-4107
Denso 234-4107 Oxygen Sensor, Upstream
4.29 Reviews
$102.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010-2013 Ford Transit Connect, 2009-2011 Ford Focus, 2008-2011 Ford Focus, 2008-2011 Ford Focus, 2008-2011 Ford Focus, 2007-2007 Ford Focus, 2007-2007 Ford Focus, 2007-2007 Ford Focus, 2007-2007 Ford Focus, 2006-2006 Ford Focus, 2006-2006 Ford Focus, 2006-2006 Ford Focus, 2006-2006 Ford Focus
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
Part interchange
234-4107, 22015, 3S4Z9F472DA, 18029, ES11075, 250-24776, 350-34028, DY1028
item #1004YZRW
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Walker ProductsPart # 250-24776
Walker Products 250-24776 Oxygen Sensor, Upstream
56 Reviews
$58.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010-2013 Ford Transit Connect, 2009-2011 Ford Focus, 2008-2011 Ford Focus, 2008-2011 Ford Focus, 2008-2011 Ford Focus
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Installation PositionUpstream
Item LocatedUnited States
Part interchange
250-24776
item #1001PDC2
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DensoPart # 234-4609
Denso 234-4609 Oxygen Sensor
4.29 Reviews
$35.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2010-2010 Ford Flex, 2010-2010 Ford Flex, 2010-2010 Ford Fusion, 2010-2010 Ford Fusion, 2010-2010 Ford Taurus, 2010-2010 Lincoln MKS, 2010-2010 Lincoln MKT, 2010-2010 Lotus Evora, 2010-2010 Mercury Milan, 2010-2010 Mercury Milan, 2010-2010 Mercury Milan, 2008-2011 Mazda Tribute, 2008-2009 Ford Fusion, 2007-2009 Mercury Milan, 2007-2007 Ford Fusion, 2006-2009 Ford Fusion, 2006-2009 Mercury Milan, 2006-2006 Mazda Tribute, 2006-2006 Mazda Tribute, 2005-2010 Ford Escape
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
Quantity1
Item LocatedUnited States
Part interchange
234-4609, ZZD118860, ZZC018861, ZZCC18860, ZZTT18861, ZZC418861, ZZC018860, ZZC318860,
...View moreitem #1005HRL8
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BoschPart # 15729
Oxygen Sensor - Bosch 15729
46 Reviews
$50.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2012-2015 Ford F-53 Motorhome Chassis, 2012-2015 Ford F-59 Commercial Stripped Chassis, 2011-2016 Ford F-250 Super Duty, 2011-2016 Ford F-350 Super Duty, 2011-2015 Ford E-350 Super Duty, 2011-2015 Ford E-450 Super Duty, 2011-2014 Ford F-150, 2011-2011 Ford Crown Victoria, 2011-2011 Ford Ranger, 2011-2011 Ford Ranger, 2010-2016 Ford F-450 Super Duty, 2010-2014 Ford F-150, 2010-2011 Mazda Tribute, 2010-2010 Ford Crown Victoria, 2010-2010 Ford Flex, 2010-2010 Ford Flex, 2010-2010 Ford Fusion, 2010-2010 Ford Fusion, 2010-2010 Mazda B2300, 2010-2010 Mercury Milan
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2009 Ford Focus
QuantityOne Set
Item LocatedUnited States
Part interchange
15729
item #1002DW6N
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.
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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Why Is My Car Running Worse After a New O2 Sensor?
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