Denso 234-4045 Oxygen Sensor - Upstream, Upstream Front or Upstream Left
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4045 Oxygen Sensor - Upstream, Upstream Front or Upstream Left

Brand Denso 234-4045
Position Upstream
Connector Gender Male
Mounting Type Threaded
Sensor Type Heated
Thread Diameter 0.708
Universal Or Specific Fit Specific
Wire Quantity 4
Wiring Harness Length 18.90
Product line OE Style
Fits Ford, Lincoln, Mercury, Mazda, and Plymouth · 147 vehicles

OE-style replacement. Precision-built for exact replacement and a first-time fit.

Heated sensor. Helps maintain accurate readings for improved engine performance and fuel efficiency.

Aluminum oxide trap layer. Protects the ceramic element from silicone and lead poisoning.

Cross-references ACDelco 213-1459, ACDelco 213-1460 and BorgWarner OS1949 for the same application. See all 31.

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Denso OE Style Oxygen Sensor 234-4045

Denso 234-4045 is an OE Style heated oxygen sensor built for direct replacement on a wide range of Ford, Lincoln, Mercury, Mazda, and related applications. It is engineered for specific-fit installation and accurate exhaust feedback on upstream positions, including Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis applications.

Key Features

  • Heated oxygen sensor for upstream exhaust monitoring
  • Specific fit design for direct replacement applications
  • 4-wire configuration with male connector
  • Threaded mounting with 0.708 in. thread diameter
  • 18.90 in. wiring harness length for OE-style routing
  • Built to OE standards for exact replacement fit
  • Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination

OE Style Construction

Denso’s OE Style line focuses on factory-style fit and function, with precision-built components that match the original sensor layout. Part number 234-4045 is designed for upstream exhaust locations where stable air-fuel feedback matters for drivability, emissions control, and fuel economy. This part cross-references Bosch (e.g., 15717, 15719) for the same application.

Vehicle Fitment

  • Fits 1999-2011 Ford Crown Victoria, Upstream
  • Fits 2000-2011 Lincoln Town Car, Upstream
  • Fits 1999-2011 Mercury Grand Marquis, Upstream
  • Fits 2005-2007 Ford Five Hundred, Upstream Left
  • Fits 2005-2007 Ford Freestyle, Upstream Left
  • Fits 2005-2007 Ford Taurus, Upstream
  • Fits 2005-2007 Mercury Montego, Upstream Left
  • Fits 2001-2006 Ford Escape, Upstream Front
  • Fits 2005-2006 Ford GT, Upstream
  • Fits 2001-2006 Mazda Tribute, Upstream Front
  • Fits 2005-2006 Mercury Mariner, Upstream Front
  • Fits 2000-2005 Ford Excursion, Upstream
  • Fits 2005 Mercury Sable, Upstream
  • Fits 2003-2004 Ford E-150, Upstream
  • Fits 2003-2004 Ford E-150 Club Wagon, Upstream
  • Fits 2003-2004 Ford E-250, Upstream
  • Fits 2003-2004 Ford E-350 Club Wagon, Upstream
  • Fits 2000-2004 Ford E-350 Super Duty, Upstream
  • Fits 2001-2004 Ford Escape, Upstream
  • Fits 2000-2004 Ford F-250 Super Duty, Upstream
  • Fits 2000-2004 Ford F-350 Super Duty, Upstream
  • Fits 2000-2004 Ford Focus, Upstream
  • Fits 2001-2004 Mazda Tribute, Upstream
  • Fits 2003-2004 Mercury Marauder, Upstream
  • Fits 2001-2003 Ford Escort, Upstream
  • Fits 2000-2002 Ford E-150 Econoline, Upstream
  • Fits 2000-2002 Ford E-150 Econoline Club Wagon, Upstream
  • Fits 2000-2002 Ford E-250 Econoline, Upstream
  • Fits 2000-2002 Ford E-350 Econoline Club Wagon, Upstream
  • Fits 2000-2002 Ford F-150, Upstream
  • Fits 2000-2002 Mercury Cougar, Upstream
  • Fits 2000 Ford Contour, Upstream
  • Fits 2000 Ford Taurus, Upstream
  • Fits 2000 Mercury Mystique, Upstream
  • Fits 2000 Mercury Sable, Upstream
  • Fits 2000 Plymouth Breeze, Upstream
  • Fits 1999 Ford Contour, Upstream
  • Fits 1999 Ford E-250 Econoline, Upstream
  • Fits 1999 Ford E-350 Econoline Club Wagon, Upstream
  • Fits 1999 Ford E-350 Super Duty, Upstream
  • Fits 1999 Ford Taurus, Upstream
  • Fits 1998-1999 Lincoln Town Car, Upstream
  • Fits 1999 Mercury Cougar, Upstream
  • Fits 1999 Mercury Mystique, Upstream
  • Fits 1999 Mercury Sable, Upstream

Common Issues This Sensor Can Address

  • Fault codes related to upstream oxygen sensor performance
  • Rough idle or inconsistent air-fuel control
  • Reduced fuel economy caused by inaccurate exhaust readings
  • Delayed sensor response during closed-loop operation
  • Emissions test failures tied to a worn sensor

Installation Notes and Tips

Use the vehicle’s exact year, make, model, and upstream position before ordering. This is a specific-fit sensor with a threaded mount and male connector, so connector style, harness length, and sensor location should be matched to the original part. For Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis applications, confirm the upstream sensor configuration before installation. Denso 234-4045 is also referenced in OE-style replacement searches for Ford and Mazda upstream oxygen sensor applications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The sensor uses an aluminum oxide trap layer to help shield the ceramic element from silicone and lead contamination, supporting long service life and stable engine performance.

Related reading

This part fits 147 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelFuel TypePositionNotes
2011FordCrown Victoria—UpstreamOE Style
2011LincolnTown Car—UpstreamOE Style
2011MercuryGrand Marquis—UpstreamOE Style
2010FordCrown Victoria—UpstreamOE Style
2010LincolnTown Car—UpstreamOE Style
2010MercuryGrand Marquis—UpstreamOE Style
2009FordCrown Victoria—UpstreamOE Style
2009LincolnTown Car—UpstreamOE Style
2009MercuryGrand Marquis—UpstreamOE Style
2008FordCrown Victoria—UpstreamOE Style
2008LincolnTown Car—UpstreamOE Style
2008MercuryGrand Marquis—UpstreamOE Style
2007FordCrown Victoria—UpstreamOE Style
2007FordFive Hundred—Upstream LeftOE Style
2007FordFreestyle—Upstream LeftOE Style
2007FordTaurus—Upstreamw/ 15" Upstream Sensor; OE Style
2007LincolnTown Car—UpstreamOE Style
2007MercuryGrand Marquis—UpstreamOE Style
2007MercuryMontego—Upstream LeftOE Style
2006FordCrown Victoria—UpstreamOE Style
2006FordEscape—Upstream FrontOE Style
2006FordFive Hundred—Upstream LeftOE Style
2006FordFreestyle—Upstream LeftOE Style
2006FordGT—UpstreamOE Style
2006FordTaurus—Upstreamw/ 15" Upstream Sensor; OE Style
2006LincolnTown Car—UpstreamOE Style
2006MazdaTribute—Upstream FrontOE Style
2006MercuryGrand Marquis—UpstreamOE Style
2006MercuryMariner—Upstream FrontOE Style
2006MercuryMontego—Upstream LeftOE Style
2005FordCrown Victoria—UpstreamOE Style
2005FordEscape—Upstream FrontOE Style
2005FordExcursion—UpstreamOE Style
2005FordFive Hundred—Upstream LeftOE Style
2005FordFreestyle—Upstream LeftOE Style
2005FordGT—UpstreamOE Style
2005FordTaurus—Upstreamw/ 15" Upstream Sensor; OE Style
2005LincolnTown Car—UpstreamOE Style
2005MazdaTribute—Upstream FrontOE Style
2005MercuryGrand Marquis—UpstreamOE Style
2005MercuryMariner—Upstream FrontOE Style
2005MercuryMontego—Upstream LeftOE Style
2005MercurySable—Upstreamw/ 15" Upstream Sensor; OE Style
2004FordCrown Victoria—UpstreamOE Style
2004FordE-150—UpstreamOE Style
2004FordE-150 Club Wagon—UpstreamOE Style
2004FordE-250—UpstreamOE Style
2004FordE-350 Club Wagon—UpstreamOE Style
2004FordE-350 Super Duty—UpstreamOE Style
2004FordEscape—Upstream FrontOE Style
2004FordEscape—UpstreamOE Style
2004FordExcursion—UpstreamOE Style
2004FordF-250 Super Duty—UpstreamOE Style
2004FordF-350 Super Duty—UpstreamOE Style
2004FordFocus—UpstreamOE Style
2004LincolnTown Car—UpstreamOE Style
2004MazdaTribute—Upstream FrontOE Style
2004MazdaTribute—UpstreamOE Style
2004MercuryGrand Marquis—UpstreamOE Style
2004MercuryMarauder—UpstreamOE Style
2003FordCrown Victoria—UpstreamOE Style
2003FordE-150—UpstreamOE Style
2003FordE-150 Club Wagon—UpstreamOE Style
2003FordE-250—UpstreamOE Style
2003FordE-350 Club Wagon—UpstreamOE Style
2003FordE-350 Super Duty—UpstreamOE Style
2003FordEscape—Upstream FrontOE Style
2003FordEscape—UpstreamOE Style
2003FordEscort—UpstreamOE Style
2003FordExcursion—UpstreamOE Style
2003FordF-250 Super Duty—UpstreamOE Style
2003FordF-350 Super Duty—UpstreamOE Style
2003FordFocus—UpstreamOE Style
2003LincolnTown Car—UpstreamOE Style
2003MazdaTribute—Upstream FrontOE Style
2003MazdaTribute—UpstreamOE Style
2003MercuryGrand Marquis—UpstreamOE Style
2003MercuryMarauder—UpstreamOE Style
2002FordCrown Victoria—UpstreamOE Style
2002FordE-150 Econoline—UpstreamOE Style
2002FordE-150 Econoline Club Wagon—UpstreamOE Style
2002FordE-250 Econoline—UpstreamOE Style
2002FordE-350 Econoline Club Wagon—UpstreamOE Style
2002FordE-350 Super Duty—UpstreamOE Style
2002FordEscape—Upstream FrontOE Style
2002FordEscape—UpstreamOE Style
2002FordEscort—UpstreamOE Style
2002FordExcursion—UpstreamOE Style
2002FordF-150—UpstreamOE Style
2002FordF-250 Super Duty—UpstreamOE Style
2002FordF-350 Super Duty—UpstreamOE Style
2002FordFocus—UpstreamOE Style
2002LincolnTown Car—UpstreamOE Style
2002MazdaTribute—Upstream FrontOE Style
2002MazdaTribute—UpstreamOE Style
2002MercuryCougar—UpstreamOE Style
2002MercuryGrand Marquis—UpstreamOE Style
2001FordCrown Victoria—UpstreamOE Style
2001FordE-150 Econoline—UpstreamOE Style
2001FordE-150 Econoline Club Wagon—UpstreamOE Style
2001FordE-250 Econoline—UpstreamOE Style
2001FordE-350 Econoline Club Wagon—UpstreamOE Style
2001FordE-350 Super Duty—UpstreamOE Style
2001FordEscape—Upstream FrontOE Style
2001FordEscape—UpstreamOE Style
2001FordEscort—UpstreamOE Style
2001FordExcursion—UpstreamOE Style
2001FordF-150—UpstreamOE Style
2001FordF-250 Super Duty—UpstreamOE Style
2001FordF-350 Super Duty—UpstreamOE Style
2001FordFocus—UpstreamOE Style
2001LincolnTown Car—UpstreamOE Style
2001MazdaTribute—Upstream FrontOE Style
2001MazdaTribute—UpstreamOE Style
2001MercuryCougar—UpstreamOE Style
2001MercuryGrand Marquis—UpstreamOE Style
2000FordContour—UpstreamOE Style
2000FordCrown Victoria—UpstreamOE Style
2000FordE-150 Econoline—UpstreamOE Style
2000FordE-150 Econoline Club Wagon—UpstreamOE Style
2000FordE-250 Econoline—UpstreamOE Style
2000FordE-350 Econoline Club Wagon—UpstreamOE Style
2000FordE-350 Super Duty—UpstreamOE Style
2000FordExcursion—UpstreamOE Style
2000FordF-150—UpstreamOE Style
2000FordF-250 Super Duty—UpstreamOE Style
2000FordF-350 Super Duty—UpstreamOE Style
2000FordFocus—UpstreamOE Style
2000FordTaurus—UpstreamOE Style
2000LincolnTown Car—UpstreamOE Style
2000MercuryCougar—UpstreamOE Style
2000MercuryGrand Marquis—UpstreamOE Style
2000MercuryMystique—UpstreamOE Style
2000MercurySable—UpstreamOE Style
2000PlymouthBreeze—UpstreamOE Style
1999FordContour—UpstreamUpstream Sensor w/ Round Connector; OE Style
1999FordCrown VictoriaGASUpstreamOE Style
1999FordE-250 EconolineBI-FUELUpstreamw/ 19" Upstream Sensors; OE Style
1999FordE-350 Econoline Club WagonBI-FUELUpstreamw/ 19" Upstream Sensors; OE Style
1999FordE-350 Super DutyBI-FUELUpstreamw/ 19" Upstream Sensors; OE Style
1999FordTaurusGASUpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
1999LincolnTown Car—UpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
1999MercuryCougar—UpstreamUpstream Sensor w/ Round Connector; OE Style
1999MercuryGrand Marquis—UpstreamOE Style
1999MercuryMystique—UpstreamUpstream Sensor w/ Round Connector; OE Style
1999MercurySable—UpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
1998LincolnTown Car—UpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
Directly replaces or cross-references 31 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 213-1459ACDelco — 213-1460BorgWarner — OS1949BorgWarner — OS1992BorgWarner — OS2430Bosch — 15717Bosch — 15719Delphi — ES10841Delphi — ES20104Ford — 5C5Z9F472BAFord — 6L7Z9F472BAFord — F8VZ9F472BAFord — MAS559F472AAFord — XC2Z9F472BAFord — XC2Z9F472BBFord — YL8Z9F472AAFord — YL8Z9F472ADMazda — AJ0318861CMazda — AJ0318861DMotorcraft — DY823Motorcraft — DY850Motorcraft — DY878Motorcraft — DY1040NTK — 22045NTK — 22060NTK — 22113Standard Ignition — SG1198Standard Ignition — SG1800Standard Ignition — SG1813Walker Products — 250-24302Walker Products — 350-34210