Walker 350-34651 Oxygen Sensor - Upstream

Walker 350-34651 Oxygen Sensor for Toyota Celica

Walker Products 350-34651 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Toyota applications. It is built for the upstream position and uses a 4-wire design with a threaded mount for direct replacement service on the listed vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for the upstream location
• 4-wire configuration with male connector
• Threaded mounting design with 18.0 mm thread diameter
• 17.24 in. wiring harness length and 20.79 in. overall length
• Radiused polygon connector shape for application-specific fitment

Product Details

This Walker Products Aftermarket oxygen sensor is designed for 2003-2005 Toyota Celica upstream applications, including Bank 1 Sensor 1 service needs. Walker Products 350-34651 is intended to provide the ECU with the diagnostic feedback required for proper engine management on the listed fitment. For drivers searching for a 2003 Toyota Celica upstream oxygen sensor, a 2004 Toyota Celica front oxygen sensor, or a 2005 Toyota Celica Bank 1 Sensor 1 replacement, this part matches the specified application.

Walker Products has focused on engine management and oxygen/air-fuel sensor coverage for decades, with OE-replacement engineering and application-specific cataloging. The 350-34651 part number is also referenced for the same Toyota Celica upstream application under Walker Products Aftermarket listings.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Confirm the upstream position before ordering and compare the connector, thread size, and harness length to the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since physical damage can shorten service life. Verify the vehicle’s fault codes and sensor location so the replacement matches the Bank 1 Sensor 1 or front oxygen sensor requirement on the Toyota Celica.

Quality Assurance

Walker Products is an ISO 9001 / TS 16949 certified automotive manufacturer with long-standing OE-replacement experience in engine management sensors. Part number 350-34651 is built for the specified application and fitment position to support proper ECU feedback on the listed Toyota Celica models.