Walker 350-33038 Oxygen Sensor - Upstream

Walker 350-33038 Oxygen Sensor for Upstream Applications

Walker Products 350-33038 is a heated upstream oxygen sensor built as a specific-fit OE replacement for select Audi, Saab, Jaguar, and Volkswagen applications. It is engineered to provide the ECU with the feedback needed for fuel control and emissions monitoring on vehicles that use a 3-wire, threaded sensor design.

Key Features

• Heated oxygen sensor for upstream placement
• Specific-fit design for direct application matching
• 3-wire configuration with 20-gauge wiring
• 45.39 in. wiring harness length and 48.94 in. overall length
• 18.0 mm thread diameter with threaded mounting type
• Radiused polygon connector shape with male and female connector ends listed in the application data

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for worldwide vehicle coverage. Part number 350-33038 is intended for upstream sensor locations where accurate exhaust feedback is required for the ECU to manage air-fuel ratio, emissions, and drivability. This part number appears in fitment for models such as Audi 80, Audi 100, Saab 900, Saab 9000, Jaguar XJS, and Volkswagen Golf, Jetta, Fox, Passat, Cabriolet, and Quantum across the listed model years.

This part cross-references no listed interchange numbers in the provided data. Walker Products 350-33038 is a practical choice when replacing an upstream oxygen sensor on older European vehicles that use a threaded, heated, 3-wire design.

What It Helps Address

• Check engine or MIL illumination tied to oxygen sensor faults
• Poor fuel economy caused by incorrect exhaust feedback
• Rough running or inconsistent engine performance
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes related to the affected sensor circuit

Installation Notes and Tips

Verify the vehicle’s year, make, model, and upstream sensor position before ordering. Confirm connector style, thread diameter, harness length, and wire count against the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since damaged wiring can shorten sensor life and affect ECU feedback.

Fits 1980-1994 Jaguar XJS, upstream; fits 1986-1991 Jaguar XJ6, upstream; fits 1988-1991 Jaguar Vanden Plas, upstream; fits 1986-1994 Saab 900, upstream; fits 1986-1991 Saab 9000, upstream; fits 1985-1987 Volkswagen Golf, upstream; fits 1987-1992 Volkswagen Jetta, upstream; fits 1988-1990 Volkswagen Fox, upstream; fits 1990 Volkswagen Passat, upstream; fits 1988-1989 Volkswagen Cabriolet, upstream; fits 1986-1988 Volkswagen Quantum, upstream; fits 1988-1992 Audi 80, upstream; fits 1988-1992 Audi 80 Quattro, upstream; fits 1988-1992 Audi 90 Quattro, upstream; fits 1989-1991 Audi 100, upstream; fits 1989-1991 Audi 100 Quattro, upstream; fits 1989-1991 Audi 200, upstream; fits 1989-1991 Audi 200 Quattro, upstream; fits 1988-1991 Audi 90, upstream; fits 1990-1991 Audi Coupe Quattro, upstream; fits 1986-1988 Audi 5000 Quattro, upstream; fits 1987 Audi Coupe, upstream; fits 1990-1994 Audi V8 Quattro, upstream; fits 1993 Jaguar XJS, upstream; fits 1986-1987 Jaguar Vanden Plas, upstream; fits 1987 Volkswagen Fox, upstream; fits 1985-1986 Volkswagen Jetta, upstream.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures under Automotive ISO9001/TS 16949 certification. The 350-33038 is built for application-specific fitment and ECU feedback requirements in the listed vehicles.