Walker 350-34836 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34836 Oxygen Sensor Overview

Walker Products 350-34836 is a heated oxygen sensor built as an OE-style replacement for specific Audi, Porsche, and Volkswagen applications. It is engineered for the correct fitment position and ECU feedback, helping maintain accurate exhaust monitoring on vehicles such as the Audi Q7, Audi A6 Quattro, and Porsche 911.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for direct replacement use. The 350-34836 follows that approach with a specific-fit design, a 4-wire heated layout, and a threaded mounting style for the listed downstream and upstream positions.

Key Features

• Part number: 350-34836
• Heated oxygen sensor for emissions and engine management systems
• Specific-fit design for listed vehicle applications
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector
• 18.0 mm thread diameter
• Overall length: 11.81 in.
• Wiring harness length: 8.46 in.
• Threaded mounting type

Detailed Description

The Walker 350-34836 oxygen sensor is designed to replace the original sensor on select vehicles where precise exhaust feedback is required by the ECU. It is listed for downstream rear, downstream right, downstream left, downstream, and upstream right positions depending on application, including 2025-2026 Porsche 911, 2022-2024 Porsche 911, 2020 Porsche 911, 2017-2019 Audi Q7, 2016-2018 Audi A6 Quattro, 2016-2018 Audi A7 Quattro, 2015-2018 Audi A8 Quattro, and 2014-2017 Volkswagen Vento.

This sensor is intended for buyers searching for a direct-fit downstream oxygen sensor for Audi Q7, an OE replacement oxygen sensor for Audi A6 Quattro, or a replacement oxygen sensor for Porsche 911 applications. Part number 350-34836 is built to match the specified application, connector style, and mounting position so the vehicle’s emissions monitoring system can read exhaust conditions correctly.

What It Can Help Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel readings
• Higher exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the exact year, make, model, and sensor position before ordering. This part is specific fit, so match the downstream right, downstream left, downstream rear, downstream, or upstream right location to the vehicle listing. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since damaged wiring can shorten sensor life and affect system feedback.

For best results, verify thread diameter, connector shape, and harness length against the original sensor. If the vehicle has stored fault codes, diagnose the related circuit and clear codes after the repair is completed.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified manufacturer. The 350-34836 is produced as an OE replacement sensor for the listed applications and fitment positions.