Walker 350-31020 Oxygen Sensor - Upstream

Walker 350-31020 Oxygen Sensor for Upstream Applications

Walker Products 350-31020 is a specific-fit oxygen sensor engineered as an OE-style replacement for select Ford, Jeep, and Mercury applications. It is built for upstream placement and helps the ECU monitor exhaust oxygen content for accurate fuel control and emissions feedback.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Upstream mounting position for front sensor service
• Non-heated sensor design
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon female connector for application-specific connection
• 13.31 in. wiring harness length with 20-gauge wire
• Overall length: 16.85 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed for OE replacement use. Part number 350-31020 is manufactured for the specified application and fitment position, helping restore the diagnostic feedback the ECU expects from the upstream oxygen sensor circuit. This part number is listed for 1981-1986 Jeep Cherokee, CJ5, CJ7, Grand Wagoneer, J10, Scrambler, and Wagoneer; 1984-1986 Ford Bronco, E-150 Econoline, E-150 Econoline Club Wagon, E-250 Econoline, E-250 Econoline Club Wagon, F-150, F-250, and Tempo; plus 1986 Ford Taurus and Mercury Sable, and 1984-1986 Mercury Topaz. Walker 350-31020 is also referenced for upstream service on these vehicles where the front oxygen sensor is required.

This part cross-references Bosch 13913 for the same application.

What It Helps Address

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

Installation Notes and Tips

Verify the connector shape, thread diameter, and harness length before installation. Inspect the sensor wiring harness and connector for physical damage, since damaged wiring can shorten service life and affect signal quality. Confirm the correct upstream location for your vehicle before replacing the sensor. For fitment search terms, this part is commonly selected for a Ford F-150 upstream oxygen sensor, Jeep CJ7 upstream oxygen sensor, and Mercury Topaz upstream oxygen sensor.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and the company is ISO 9001/TS 16949 certified. Since 1946, Walker Products has supplied engine management and fuel system components for automotive applications.