Walker 350-34397 Oxygen Sensor - Downstream

Walker 350-34397 Oxygen Sensor Overview

Walker Products 350-34397 is a heated oxygen sensor built as a specific-fit OE-style replacement for downstream applications. It is engineered for vehicles that rely on accurate exhaust feedback to help the ECU manage fuel delivery and emissions performance.

Compatible With 2004-2008 Chevrolet Astra and 2004-2006 Mitsubishi Lancer and Mitsubishi Outlander downstream applications, this sensor is a direct-fit option for targeted bank 1 sensor 2 locations. The Walker Products Aftermarket line focuses on application-specific engine management and oxygen/air-fuel sensors for precise fitment and diagnostic feedback.

Key Features

• Part number: 350-34397
• Heated oxygen sensor design for faster operating temperature
• Specific fit for the listed downstream applications
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 19.21 in.
• Overall length: 22.76 in.

Detailed Description

Walker Products 350-34397 is designed for downstream oxygen sensor service where the ECU depends on stable exhaust-gas feedback. The sensor is built for the listed Chevrolet Astra, Mitsubishi Lancer, and Mitsubishi Outlander applications, including bank 1 sensor 2 positions noted in the fitment data. As an OE-replacement style part, it is intended to match the application-specific fitment position and electrical feedback requirements of the vehicle.

Walker Products Aftermarket has focused on engine management and oxygen/air-fuel sensors since 1946, with ISO 9001/TS 16949 certified manufacturing. This part cross-references no additional part numbers in the provided data.

What It Helps Fix

• Check engine light or MIL illumination related to oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to sensor signal issues
• Elevated exhaust emissions from a failing downstream sensor
• Diagnostic trouble codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Verify the vehicle’s exact year, make, model, and downstream bank 1 sensor 2 location before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion, since physical damage can shorten service life and affect signal quality. Confirm the threaded mounting point and connector style match the original sensor before replacement.

Quality Assurance

Walker Products manufactures this oxygen sensor as a specific-application replacement part under ISO 9001/TS 16949 certified processes. The 350-34397 is built to provide the diagnostic feedback expected by the ECU in the listed applications.