Walker 350-34451 Oxygen Sensor - Downstream Front or Downstream Rear

Walker 350-34451 Oxygen Sensor Overview

Walker Products 350-34451 is a heated oxygen sensor built as a direct-fit replacement for specific Honda Accord and Acura MDX applications. It is engineered for the correct mounting position and ECU feedback required by the vehicle’s emissions management system.

Walker Products Aftermarket focuses on OE-style engine management and oxygen/air-fuel sensors for precise application fitment. The 350-34451 follows that approach with a specific-fit design, threaded mounting, and a 4-wire heated configuration for the listed downstream positions.

Key Features

• Heated oxygen sensor for emissions and fuel-control feedback
• Specific-fit design for listed Honda Accord and Acura MDX applications
• 4-wire construction with 22-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 23.15 in.; overall length: 26.69 in.

Detailed Description

The Walker 350-34451 oxygen sensor is designed for downstream use where the ECU relies on accurate exhaust feedback to monitor catalyst and emissions performance. It is a direct replacement for select 2008-2020 Honda Accord and 2017-2020 Acura MDX applications, including downstream rear and downstream front positions as listed. If you are replacing a Honda Accord downstream oxygen sensor or an Acura MDX Bank 1 Sensor 2 rear sensor, this part number provides the specified fitment and connector style.

Walker Products 350-34451 is manufactured for the exact application, fitment position, and diagnostic feedback expected by the ECU. This part cross-references standard OE-style replacement needs for the same application.

What It Helps Address

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

Installation Notes and Tips

• Confirm the vehicle position before ordering: downstream rear or downstream front, depending on application.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Verify thread size and connector shape against the original sensor to ensure proper fit.
• Clear stored fault codes after installation and confirm the repair with a scan tool.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates with ISO 9001/TS 16949 certification. The 350-34451 is built as an OE-style replacement sensor for the listed Honda Accord and Acura MDX applications.