Walker 350-35031 Oxygen Sensor - Downstream, Upstream, Upstream Left or Upstream Right

Walker 350-35031 Oxygen Sensor Overview

Walker Products 350-35031 is a heated oxygen sensor built as a specific-fit OE replacement for select upstream applications. It is engineered to provide the ECU with the feedback needed for fuel control and emissions monitoring on vehicles such as Audi A4, Audi Q5, Hyundai Elantra, Kia Niro, and Volkswagen Tiguan.

Walker Products Aftermarket focuses on application-specific engine management sensors, and this part follows that approach with the correct fitment position, connector style, and threaded mounting design for the listed vehicles.

Key Features

• Heated oxygen sensor for upstream placement
• Specific-fit design for direct application matching
• 5-wire configuration with 20-gauge wiring
• Radiused polygon male connector
• 18.0 mm thread diameter with threaded mounting type
• Wiring harness length: 23.15 in.; overall length: 26.69 in.

Detailed Product Description

The Walker 350-35031 oxygen sensor is designed for upstream use where the engine management system relies on accurate exhaust feedback to adjust air-fuel ratio. As a heated sensor, it helps the ECU reach operating feedback more quickly, which is important for drivability, emissions control, and fuel management on modern vehicles.

This part number is listed across a wide range of applications, including 2022-2026 Hyundai Elantra, 2020-2024 Volkswagen Tiguan, 2021-2022 Volkswagen Taos, 2021-2022 Kia Niro, and multiple Audi models such as A3, A4, A5, Q5, Q7, S4, S5, SQ5, and A6 Quattro. It is also listed for select Hyundai Ioniq, Kia Rio, Kia Soul, Fiat 500, and Dodge Dart applications. For buyers searching for an upstream oxygen sensor for Audi Q5 or a replacement oxygen sensor for Hyundai Elantra upstream position, Walker Products 350-35031 is built to match the listed OE-style application requirements.

Walker Products Aftermarket has supplied engine management and oxygen/air-fuel sensors since 1946, and this part reflects that focus on application-specific replacement parts. This part cross-references no listed alternate part numbers in the provided data.

What It Can Help Address

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

• Confirm the vehicle year, make, model, and sensor position before ordering.
• Verify the upstream location, including left or right bank applications where listed.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Check the threaded mounting point and exhaust bung condition before fitting the sensor.
• Use the listed connector shape, wire count, and harness length to confirm proper routing and plug alignment.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement parts for specific applications and supports them with ISO 9001/TS 16949 certified manufacturing practices. The 350-35031 is built to deliver the diagnostic feedback expected by the ECU for the listed fitments.