Walker 350-34665 Oxygen Sensor - Downstream or Downstream Right

Walker OE Replacement Oxygen Sensor

Walker OE Replacement oxygen sensor Part Number 350-34665 is a specific-fit, heated narrow-band sensor engineered for direct replacement in select Ford and Lincoln applications. It delivers the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Compatible with downstream applications on the Ford Transit-150, Transit-250, Transit-350, Transit-350 HD, Bronco, Edge, and Lincoln Nautilus, this sensor is built around the original application requirements for fitment position, connector style, and thread specification.

Key Features

• Heated narrow-band oxygen sensor for downstream monitoring
• Specific-fit design for application-matched installation
• 4-wire configuration with blade terminals
• Oblong male connector with female terminals
• M18 x 1.5 thread size and threaded mounting type
• 22 mm wrench size and 318 mm overall length
• Walker OE Replacement part number 350-34665

Product Details

Walker Products designs its engine management and oxygen/air-fuel sensors as OE replacement components for vehicle-specific applications. Part Number 350-34665 is configured for downstream use and built to provide the feedback the engine control unit relies on for closed-loop operation and emissions monitoring. This makes it a direct replacement choice for drivers servicing a Ford Transit-150, Ford Transit-250, Ford Transit-350, Ford Transit-350 HD, Ford Bronco, Ford Edge, or Lincoln Nautilus with the listed downstream sensor position.

The Walker OE Replacement line focuses on application-specific fitment, connector configuration, and sensor output characteristics so the replacement part matches the original system requirements. For buyers searching for a downstream oxygen sensor for Ford Transit-150 2020-2025, Ford Bronco 2021-2024, or Lincoln Nautilus 2019-2023, this part number provides a targeted OE-style solution.

What It Helps Address

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

Installation Notes

Verify the downstream right or downstream position before ordering, since fitment varies by vehicle and sensor location. Inspect the sensor wiring harness and connector for damage during diagnosis, and confirm the thread size, connector shape, and wire count match the original part. This sensor uses a threaded M18 x 1.5 mounting design and a 22 mm wrench size.

Fits 2020-2025 Ford Transit-150, downstream right. Fits 2020-2025 Ford Transit-250, downstream right. Fits 2020-2025 Ford Transit-350, downstream right. Fits 2020-2025 Ford Transit-350 HD, downstream right. Fits 2021-2024 Ford Bronco, downstream. Fits 2023-2024 Ford Edge, downstream. Fits 2019-2023 Lincoln Nautilus, downstream.

Quality Assurance

Walker Products has manufactured engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. Part Number 350-34665 is built as an OE replacement oxygen sensor for the specified applications and fitment positions.