Walker 350-34578 Oxygen Sensor - Upstream

Walker OE Replacement Oxygen Sensor 350-34578

Walker OE Replacement part number 350-34578 is a heated narrow-band oxygen sensor built as a specific-fit replacement for the original sensor location. It uses a 4-wire, threaded design with an M18 x 1.5 thread size, oblong female connector, and male spade terminals for direct-style service on the vehicle.

Key Features

• Heated narrow-band oxygen sensor for ECU feedback
• Specific-fit design for the intended application and mounting position
• 4-wire configuration with oblong female connector
• Male spade terminals, 4 terminal count
• Threaded mounting with M18 x 1.5 thread size
• Standard replacement grade for OE-style service
• Overall length: 600 mm

Product Details

Walker Products develops engine management and oxygen/air-fuel sensors as OE replacement parts for a wide range of vehicles. This sensor is engineered to provide the diagnostic feedback the ECU expects from the original unit, helping maintain proper fuel control and emissions monitoring. Walker OE Replacement 350-34578 is built for specific applications rather than universal use, which supports accurate fitment on the intended vehicle and sensor position. For shoppers searching for an oxygen sensor for Honda Civic or Toyota Corolla applications, this part number is a direct replacement option when the listed vehicle match is confirmed.

Walker Products has supplied engine management components since 1946 and manufactures electronic sensors under ISO 9001/TS 16949 quality systems. Part number 350-34578 is also referenced as Walker 350-34578 in catalog and service searches.

What It Helps Address

• Check engine light or MIL illumination tied to oxygen sensor faults
• Poor engine performance caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel reporting
• Higher exhaust emissions from a failing sensor signal
• Diagnostic trouble codes stored in the ECU related to the sensor circuit

Installation Notes

Confirm the connector shape, terminal style, thread size, and sensor position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals, since physical damage can shorten sensor life and affect signal quality. Use the vehicle’s service information to verify the exact application and routing before replacing the original sensor.

Quality Assurance

Walker Products manufactures this OE Replacement sensor to match the intended application and diagnostic requirements of the vehicle ECU. The brand’s sensor production is backed by ISO 9001/TS 16949 manufacturing practices and long-term engine management experience.