Walker 250-54121 Oxygen Sensor - Center or Upstream

Walker OE Base Oxygen Sensor

Walker OE Base Sensor 250-54121 is a specific-fit wide-band oxygen sensor for select Jaguar and Land Rover applications. It is built for upstream and center positions where the ECU depends on accurate exhaust feedback for fuel control and emissions monitoring.

Key Features

• Wide-band oxygen sensor with heated operation
• Specific fit for direct application matching
• 4-wire design with blade terminals
• Female connector with oblong shape
• M18 x 1.5 thread size and 22 mm wrench size
• OE Base Sensor line for application-specific replacement

Application Details

Walker Products OE Base Sensor line focuses on replacement sensors engineered for the exact vehicle application, fitment position, and ECU feedback requirements. Part number 250-54121 is listed for 2017-2020 Land Rover Discovery, upstream; 2017-2019 Jaguar F-Pace, upstream; 2017-2019 Jaguar XE, upstream; 2017-2019 Jaguar XF, upstream; and 2018-2019 Land Rover Range Rover Velar, center. This part number 250-54121 is a direct-fit oxygen sensor solution for these Jaguar and Land Rover models.

What It 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 sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes

Before replacement, inspect the sensor wiring harness and connector for physical damage, since damaged wiring can shorten sensor life and affect operation. Confirm the upstream or center position on the vehicle before installation, and verify thread size, connector style, and terminal layout against the original sensor. Part number 250-54121 uses a 4-wire, heated, wide-band configuration with a female oblong connector and blade terminals.

Quality Assurance

Walker Products has produced engine management and oxygen/air-fuel sensors since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Base Sensor line is built around application-specific fitment and ECU feedback requirements for modern emissions systems.