Walker 350-34664 Oxygen Sensor - Downstream

Walker OE Replacement Oxygen Sensor 350-34664

Walker OE Replacement 350-34664 is a heated narrow-band oxygen sensor built for specific downstream applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring on select Ford models.

Key Features

• Heated narrow-band oxygen sensor for downstream placement
• Specific-fit design for direct application matching
• 4-wire configuration with blade terminals
• Oblong male connector with female terminals
• M18 x 1.5 thread size and 22 mm wrench size
• Overall length: 708 mm
• Threaded mounting type

Application Details

This Walker oxygen sensor, part number 350-34664, is a direct OE-style replacement for downstream use on 2023-2024 Ford Bronco Sport and 2018-2022 Ford EcoSport. It is built to match the specified fitment position and deliver the diagnostic feedback expected by the vehicle’s engine control system. Walker Products develops engine management sensors for application-specific fitment, and the 350-34664 follows that approach for Ford Bronco Sport and Ford EcoSport service needs.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Rough engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel correction
• Elevated exhaust emissions from a failing sensor signal
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the downstream sensor location before ordering and compare the connector, thread size, and wire count to the original part. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect readings. Use the correct 22 mm wrench size and verify the M18 x 1.5 threaded mounting point during service.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified manufacturer. The 350-34664 is produced as an OE replacement sensor for the listed Ford applications and is backed by Walker’s established manufacturing and catalog support standards.