Walker 350-34609 Oxygen Sensor - Upstream

Walker Oxygen Sensor for Toyota Celica

Walker Products 350-34609 is a heated oxygen sensor built as a specific-fit OE replacement for select 1990-1991 Toyota Celica applications. It is designed for the upstream Bank 1 Sensor 1 position and supports the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the correct application and mounting position
• 4-wire configuration with a radiused polygon male connector
• 10.35 in. wiring harness length and 20-gauge wire
• 18.0 mm thread diameter with flange mount construction
• Overall length: 13.9 in.

Product Details

Walker Products Aftermarket 350-34609 is engineered as an OE-style replacement oxygen sensor for emissions control service. It is listed for 1990-1991 Toyota Celica, upstream, Bank 1 Sensor 1, for vehicles without California emissions certification. This part number is also referenced as Walker Products 350-34609 in catalog and fitment searches for Toyota Celica upstream oxygen sensor replacement needs.

The Walker Products engine management and oxygen/air-fuel sensor line is built around application-specific fitment, so the sensor, connector, and mounting style match the intended vehicle position. For shoppers comparing Toyota Celica oxygen sensor replacement options, this part number is a direct fit for the listed non-California emissions applications.

Common Issues This Sensor Can Address

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

Installation Notes

Verify the vehicle is a 1990-1991 Toyota Celica with non-California emissions before ordering. Confirm the upstream Bank 1 Sensor 1 location, connector shape, thread size, and harness routing against the original sensor. Inspect the wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect ECU feedback.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as OE replacement parts for worldwide vehicle applications. The company is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946. This part cross-references Walker Products Aftermarket 350-34609 for the same application.