Walker 350-35144 Oxygen Sensor - Upstream, Upstream Rear or Upstream Right

OE Replacement Oxygen Sensor for Select Ford and Land Rover

Walker OE Replacement oxygen sensor 350-35144 is a specific-fit, heated wide-band sensor built for the exact application and position listed below. It is engineered to deliver the diagnostic feedback the ECU expects on vehicles such as the Ford F-150, Ford Explorer, and Land Rover Range Rover.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed upstream and upstream rear positions
• 5-wire configuration with oblong connector and male spade terminals
• Threaded mounting with M18 x 1.5 thread size
• Standard replacement grade for OE-style service
• 22 mm wrench size and 458 mm overall length

Walker OE Replacement Line

Walker Products’ OE Replacement line is built around application-specific sensor fitment, so the sensor, connector, and harness layout match the vehicle position called out in the catalog. Part 350-35144 is intended for vehicles that rely on accurate air-fuel and oxygen sensor input for fuel control, emissions monitoring, and fault-code detection.

This part cross-references no listed aftermarket part numbers for the same application.

Vehicle Fitment

• Fits 2016-2021 Land Rover Range Rover, upstream
• Fits 2021 Land Rover Range Rover Sport, upstream
• Fits 2016-2020 Land Rover Range Rover Sport, upstream, B1S1
• Fits 2012 Ford Edge, upstream, B1S1
• Fits 2009-2012 Ford Escape, upstream, B1S1
• Fits 2012 Ford Explorer, upstream, B1S1
• Fits 2012 Ford Focus, upstream, B1S1
• Fits 2010-2012 Ford Fusion, upstream, B1S1
• Fits 2012 Ford Taurus, upstream rear
• Fits 2010 Ford Taurus, upstream rear
• Fits 2011-2012 Lincoln MKZ, upstream, B1S1
• Fits 2009-2011 Ford E-150, upstream right, B1S1
• Fits 2010-2011 Ford E-250, upstream right, B1S1
• Fits 2009-2011 Ford E-350 Super Duty, upstream right, B1S1
• Fits 2011 Ford Econoline Van, upstream right, to 2/10/2011
• Fits 2011 Ford Econoline Wagon, upstream right, to 02/10/2011
• Fits 2009-2011 Ford Expedition, upstream right, B1S1
• Fits 2011 Ford F-150, upstream right, to 01/03/2011
• Fits 2011 Ford F-250 Super Duty, upstream right, to 05/02/2011
• Fits 2011 Ford F-350 Super Duty, upstream right, to 05/02/2011
• Fits 2011 Ford Flex, upstream rear, to 12/23/2010
• Fits 2011 Ford Mustang, upstream right
• Fits 2011 Ford Taurus, upstream rear, to 01/10/2011
• Fits 2011 Lincoln MKS, upstream rear, to 12/22/2010
• Fits 2011 Lincoln MKT, upstream rear, to 12/13/2010
• Fits 2011 Lincoln Navigator, upstream right, to 12/17/2010
• Fits 2009-2011 Mercury Mariner, upstream, B1S1
• Fits 2010-2011 Mercury Milan, upstream, B1S1
• Fits 2010 Ford Econoline Van, upstream right
• Fits 2010 Ford Econoline Wagon, upstream right
• Fits 2009-2010 Ford F-150, upstream right, B1S1
• Fits 2009-2010 Ford Flex, upstream rear, B1S1
• Fits 2009-2010 Lincoln MKS, upstream rear
• Fits 2010 Lincoln MKT, upstream rear
• Fits 2009-2010 Lincoln Navigator, upstream right
• Fits 2009-2010 Mazda Tribute, upstream, B1S1
• Fits 2009 Ford E-250, upstream right, B1S2
• Fits 2008-2009 Ford Taurus, upstream rear, Calif-ESV
• Fits 2008-2009 Ford Taurus X, upstream rear, Calif-ESV
• Fits 2008-2009 Mercury Sable, upstream rear, Calif-ESV

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough running or drivability issues tied to air-fuel control
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Confirm the exact vehicle, engine calibration, and sensor position before ordering, since this part is specific to the listed upstream and upstream rear applications. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, and verify the threaded bung is clean and undamaged. Use the correct 22 mm wrench size and thread the sensor to the specified M18 x 1.5 mounting point.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts for specific applications. The company is ISO 9001/TS 16949 certified and has produced engine management components since 1946, with cataloging and packaging support built for professional automotive service.