Walker 350-35063 Oxygen Sensor - Upstream

Walker 350-35063 Oxygen Sensor for Audi S8

Walker Products 350-35063 is a heated oxygen sensor built as a specific-fit replacement for the 2007 Audi S8 upstream position. It is engineered to deliver the ECU feedback needed for accurate fuel control and emissions monitoring on the affected application.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for OE-style replacement use. The 350-35063 follows the application-specific fitment approach used across the line, with the correct connector, harness length, and threaded mounting style for the listed vehicle.

Key Features

• Specific-fit heated oxygen sensor for upstream placement
• Fits 2007 Audi S8, upstream
• Part number 350-35063 for direct catalog lookup
• 5-wire design with 20-gauge wiring
• 47.76 in. wiring harness length and 51.3 in. overall length
• 18.0 mm threaded mounting with male radiused polygon connector

Detailed Description

Walker 350-35063 is designed for the 2007 Audi S8 upstream oxygen sensor location, including the listed cylinder-bank application notes. As a heated sensor, it helps the engine management system monitor exhaust oxygen content and maintain proper air-fuel control. This makes it a practical replacement when the original sensor is no longer providing reliable ECU feedback.

For buyers searching for a 2007 Audi S8 upstream oxygen sensor, Walker Products 350-35063 offers the correct specific-fit configuration rather than a universal design. The threaded mount, connector shape, wire count, and harness length are matched to the application for cleaner installation and proper electrical connection. The part number 350-35063 is also useful when cross-checking service records or ordering by catalog reference.

What It Helps Address

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

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the upstream location and verify the 18.0 mm threaded mount and connector style match the vehicle before installation. If the original sensor failed due to wiring damage, repair the harness issue so the new sensor is not exposed to the same fault condition.

Fits 2007 Audi S8, upstream. Fits 2007 Audi S8, upstream, Cyl 4,5 per the listed application notes.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures this sensor as an OE-replacement style part for the specified application. The brand operates under Automotive ISO9001/TS 16949 certification, supporting consistent manufacturing and application-specific fitment.