Walker 350-34321 Oxygen Sensor - Downstream

Walker 350-34321 Oxygen Sensor Overview

Walker Products 350-34321 is a heated oxygen sensor built as a specific-fit OE replacement for downstream applications. It is engineered for vehicles that rely on accurate exhaust feedback to help the ECU manage fuel delivery and emissions control.

Compatible With 2018-2021 Chevrolet Beat, downstream, and select 2009-2011 Chevrolet Aveo and Aveo5 downstream bank 1 sensor 2 applications, this sensor is also listed for 2009-2010 Pontiac G3 and 2009 Pontiac G3 Wave. The Walker Products Aftermarket line focuses on application-specific engine management parts, and this sensor follows that approach with the correct connector, thread, and harness layout for the listed vehicles.

Key Features

• Part number 350-34321
• Heated oxygen sensor for downstream placement
• Specific fit design for listed vehicle applications
• 4-wire configuration with 22-gauge wiring
• Radiused polygon male connector
• 18.0 mm threaded mounting type
• Wiring harness length: 16.26
• Overall length: 19.8

Detailed Product Description

This Walker oxygen sensor is designed to provide the ECU with the exhaust feedback needed for closed-loop fuel control and emissions monitoring on the listed applications. The heated sensor design helps it reach operating temperature quickly, while the threaded mounting and application-specific connector support direct replacement on the correct downstream location. If you are replacing a failed downstream oxygen sensor on a Chevrolet Beat, Chevrolet Aveo, Chevrolet Aveo5, Pontiac G3, or Pontiac G3 Wave, part number 350-34321 is built for those exact fitment requirements.

Walker Products has focused on engine management and oxygen/air-fuel sensors for decades, and the Walker Products Aftermarket line is centered on OE-style replacement parts for specific vehicle applications. This makes 350-34321 a practical choice when you need the correct sensor type, connector shape, and harness configuration for the listed models.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to sensor signal issues
• Higher exhaust emissions from a failing oxygen sensor
• Stored ECU fault codes for the affected sensor circuit

Installation Notes and Fitment Tips

• Fits 2018-2021 Chevrolet Beat, downstream
• Fits 2009-2011 Chevrolet Aveo, downstream bank 1 sensor 2 on specific vehicle models
• Fits 2009-2011 Chevrolet Aveo5, downstream bank 1 sensor 2 on specific vehicle models
• Fits 2009-2010 Pontiac G3, downstream bank 1 sensor 2 on specific vehicle models
• Fits 2009 Pontiac G3 Wave, downstream

Before replacement, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion. Confirm the downstream location and connector style match the original part before installation. This part cross-references no additional part numbers provided for this application.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components for specific applications and supports them through ISO 9001/TS 16949 certified manufacturing practices.