Walker 250-25169 Oxygen Sensor - Upstream, Upstream Rear or Upstream Right

Walker OE Base Oxygen Sensor 250-25169

Walker OE Base Sensor 250-25169 is a specific-fit, heated wide-band oxygen sensor built for direct replacement in select Ford and Lincoln applications. It is engineered to provide the ECU with the diagnostic feedback needed for proper air-fuel control, emissions monitoring, and drivability.

Compatible With Ford F-150, Ford Mustang, Ford Edge, Ford Explorer, Ford Flex, Ford Taurus, Ford Transit-150, Ford Transit-250, Ford Transit-350, and Lincoln MKS, MKZ, MKT, and MKX applications listed below.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed vehicle applications
• 5-wire configuration with 6 terminals
• Female connector with oblong connector shape
• M18 x 1.5 thread size and 22 mm wrench size
• OE Base Sensor line for application-specific replacement

Application Details

This Walker oxygen sensor is built for upstream positions on the listed Ford and Lincoln vehicles, including upstream rear and upstream right locations where specified. Part number 250-25169 is used in emissions control systems that rely on accurate oxygen content data to manage fuel delivery and monitor catalyst performance. Walker Products develops engine management sensors as OE-style replacements, with application-specific fitment and feedback characteristics matched to the vehicle ECU requirements.

Fits 2016 Lincoln MKS, upstream. Fits 2013-2016 Lincoln MKZ, upstream. Fits 2012-2015 Ford Explorer, upstream rear. Fits 2013-2015 Ford Flex, upstream rear. Fits 2013-2015 Ford Taurus, upstream rear. Fits 2015 Ford Transit-150, upstream right. Fits 2015 Ford Transit-250, upstream right. Fits 2015 Ford Transit-350, upstream right. Fits 2015 Ford Transit-350 HD, upstream right. Fits 2013-2015 Lincoln MKS, upstream. Fits 2013-2015 Lincoln MKT, upstream rear. Fits 2012-2015 Lincoln MKX, upstream. Fits 2012-2014 Ford Edge, upstream. Fits 2011-2014 Ford F-150, upstream. Fits 2012-2014 Ford Mustang, upstream right. Fits 2011 Ford Mustang, upstream right.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Elevated exhaust emissions from poor mixture control
• Fault codes stored in the ECU for sensor or related system faults

Installation Notes

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the thread size, connector style, wire count, and mounting position match the original sensor location. For best results, verify the exact upstream position on the vehicle before installation. Part number 250-25169 should be matched to the listed application and position only.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates with ISO 9001/TS 16949 quality systems. The OE Base Sensor line is built around application-specific replacement requirements for modern emissions and engine management systems.