Walker 350-34659 Oxygen Sensor - Downstream Rear or Downstream Right

OE Replacement Oxygen Sensor for Honda Odyssey

Walker OE Replacement oxygen sensor Part Number 350-34659 is a specific-fit, heated narrow-band sensor for select Honda Odyssey applications. It is built to provide the ECU with the diagnostic feedback needed for proper fuel control and emissions monitoring.

Compatible with 2018-2024 Honda Odyssey, downstream rear, and 2025 Honda Odyssey, downstream right. This Walker oxygen sensor 350-34659 is a direct-fit option for owners replacing a failed downstream sensor on the Honda Odyssey.

Key Features

• Heated narrow-band oxygen sensor for emissions feedback
• Specific-fit design for the listed Honda Odyssey positions
• 4-wire configuration with blade terminals
• Square connector with male connector and terminal ends
• M18 x 1.5 threaded mounting for OE-style installation
• 575 mm wiring harness length and 600 mm overall length
• 22 mm wrench size for service access

Walker OE Replacement Line

Walker OE Replacement focuses on engine management and oxygen/air-fuel sensors engineered as direct replacements for original equipment applications. The line is built around application-specific fitment, position-specific feedback, and the signal quality required by the vehicle ECU.

Detailed Description

Walker 350-34659 is an OE-style oxygen sensor for downstream monitoring on the Honda Odyssey. As a narrow-band, heated sensor, it helps the engine management system track exhaust conditions and maintain the feedback needed for emissions control. The specific-fit design, threaded M18 x 1.5 mounting, and 4-wire harness layout support a clean replacement on the correct vehicle position.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Elevated exhaust emissions from a failing sensor
• Rough engine operation tied to incorrect ECU input
• Physical damage to the sensor, connector, or wiring harness

Installation Notes and Tips

Verify the vehicle position before installation: 2018-2024 Honda Odyssey uses the downstream rear location, while 2025 Honda Odyssey uses the downstream right location. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion before replacement. Confirm thread size, connector shape, and wire routing match the original part before tightening to the exhaust bung.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components and operates as an ISO 9001/TS 16949 certified company. Since 1946, Walker Products has supplied oxygen and air-fuel sensors for vehicle-specific applications.