Walker 350-34137 Oxygen Sensor - Upstream

Walker 350-34137 Oxygen Sensor for Volkswagen Passat

Walker Products 350-34137 is a heated oxygen sensor built for specific vehicle applications and positioned for upstream use. It is engineered as an OE-style replacement for the 1995 Volkswagen Passat, including non-California ESV and chassis-specific applications, with ECU feedback matched to the original sensor location.

Key Features

• Heated oxygen sensor for upstream exhaust monitoring
• Specific-fit design for 1995 Volkswagen Passat applications
• 4-wire configuration with 20-gauge wiring
• 32.4 in. wiring harness length for application-specific routing
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for proper electrical connection
• Overall length: 35.94 in.

Product Details

Walker Products Aftermarket 350-34137 is part of the Walker Products engine management sensor line, which focuses on OE-replacement oxygen and air-fuel sensors for vehicle-specific fitment. This sensor is built for upstream placement on the 1995 Volkswagen Passat and is listed for non-California ESV and chassis-specific configurations, including B1S1 applications. The heated design helps the sensor reach operating temperature quickly so the ECU can receive the exhaust feedback it expects from the original equipment setup. Walker Products 350-34137 is a direct-fit solution for drivers addressing a failed upstream oxygen sensor on a Volkswagen Passat.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor Can Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle is a 1995 Volkswagen Passat with the correct upstream position before ordering. Verify the chassis note, including the 3A-S-202 677 breakpoint where applicable, and compare the connector shape, wire count, and thread size to 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 readings.

Quality Assurance

Walker Products has supplied engine management components since 1946 and manufactures sensors for specific applications and fitment positions. The brand operates under Automotive ISO9001/TS 16949 certification, supporting consistent production and application-specific replacement parts.