Walker 250-25171 Oxygen Sensor - Upstream or Upstream Right

OE Base Oxygen Sensor for Ford and Lincoln

Walker OE Base Sensor 250-25171 is a heated wide-band oxygen sensor built as a specific-fit replacement for select Ford and Lincoln applications. It is engineered to provide the ECU with the diagnostic feedback needed for proper fuel control and emissions monitoring.

Use this Walker oxygen sensor for upstream monitoring on vehicles such as the Ford EcoSport, Ford F-150, Ford Focus, Ford Expedition, and Lincoln Navigator where the listed fitment matches your vehicle.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed upstream positions
• 5-wire configuration
• M18 x 1.5 thread size
• 22 mm wrench size
• Walker OE Base Sensor line for application-specific engine management coverage

Product Details

Walker Products 250-25171 is part of the OE Base Sensor line, which focuses on application-specific engine management sensors built for direct replacement use. This oxygen sensor is matched to the vehicle position and wiring requirements so the ECU receives the correct signal for air-fuel control and emissions system operation. It is a practical choice for drivers searching for a Ford F-150 upstream right oxygen sensor, a Ford Expedition upstream right O2 sensor, or a Lincoln Navigator upstream right wide-band sensor.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946 and manufactures to ISO 9001/TS 16949 quality standards.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Confirm the exact year, make, model, and sensor position before ordering. This part is listed for 2018-2022 Ford EcoSport upstream, 2018-2021 Ford Expedition upstream right, 2018-2021 Lincoln Navigator upstream right, 2017-2020 Ford F-150 upstream right, and 2015-2018 Ford Focus upstream. Inspect the sensor, wiring harness, and connector for damage before installation, since physical wear can shorten sensor life and affect operation.

This part cross-references no listed interchange numbers in the provided data.

Quality Assurance

Walker Products designs this sensor as an OE-style replacement for the specified application and backs its engine management catalog with long-standing manufacturing experience and ISO 9001/TS 16949 certification.