Walker 350-35139 Oxygen Sensor - Upstream Front or Upstream Left

OE Replacement Oxygen Sensor for Audi and Volkswagen

Walker OE Replacement oxygen sensor 350-35139 is a specific-fit, heated wide-band sensor built for direct application coverage on select Audi, Volkswagen, and Porsche models. It delivers the ECU feedback needed for accurate air-fuel control on upstream left and upstream front positions.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed vehicle applications
• 5-wire configuration with rectangular connector and male spade terminals
• Threaded mounting with M18 x 1.5 thread size
• 22 mm wrench size and 925 mm overall length
• OE Replacement line from Walker Products

Product Details

Walker Products develops engine management and oxygen/air-fuel sensors as OE-style replacements for vehicle-specific applications. Part number 350-35139 is engineered for the correct fitment position and diagnostic feedback expected by the ECU, helping maintain proper fuel control and emissions monitoring. This sensor is listed for 2021-2026 Audi RS6 Avant, upstream left, 2021-2026 Audi RS7 Sportback, upstream left, 2022-2023 Volkswagen Atlas, upstream front, 2022-2023 Volkswagen Atlas Cross Sport, upstream front, 2021-2023 Volkswagen Teramont, upstream left, 2019 Volkswagen Teramont, upstream left, 2018-2021 Volkswagen Atlas, upstream left, 2020-2021 Volkswagen Atlas Cross Sport, upstream left, 2019 Porsche Panamera, upstream left, and 2017-2018 Porsche Panamera, upstream left. This part cross-references no listed interchange numbers in the provided data.

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 sensor readings
• Higher exhaust emissions from faulty upstream sensing
• Fault codes stored in the ECU for sensor or related system issues

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and mounting position before installation. Inspect the sensor wiring harness and connector for physical damage, since damaged wiring can shorten service life and affect readings. Confirm the application is the correct upstream left or upstream front location for your Audi RS6 Avant, Audi RS7 Sportback, Volkswagen Atlas, Volkswagen Atlas Cross Sport, Volkswagen Teramont, or Porsche Panamera.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Replacement line is built around application-specific fitment and diagnostic performance for modern engine management systems.