Walker 350-35053 Oxygen Sensor - Upstream

Walker 350-35053 Oxygen Sensor for Audi S6 and S8

Walker Products 350-35053 is a heated oxygen sensor built as a specific-fit OE-style replacement for select 2007 Audi applications. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring on the listed upstream positions.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for the listed Audi S6 and Audi S8 applications
• Threaded mounting design with 18.0 mm thread diameter
• 5-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Wiring harness length: 16.26 in.; overall length: 19.8 in.

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed as replacement parts for original equipment applications. Part number 350-35053 is designed for upstream use on the 2007 Audi S6 and 2007 Audi S8, including cylinder-bank notes listed in the fitment data. This sensor supports the vehicle’s diagnostic system by providing the feedback the ECU uses to manage air-fuel ratio and emissions performance. This part number is 350-35053.

This part cross-references no listed interchange part numbers for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from a failing sensor signal
• Higher exhaust emissions from inaccurate ECU input
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Verify the upstream position and connector style before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life. Confirm thread size and mounting type match the vehicle before beginning service. For 2007 Audi S6 and 2007 Audi S8 upstream replacement, use the fitment notes to confirm the correct cylinder-bank application. The part number 350-35053 should be matched to the exact vehicle configuration listed.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates with Automotive ISO9001/TS 16949 certification. The Walker Products Aftermarket line is built around application-specific replacement parts for modern diagnostic systems.