Walker 250-22003 Oxygen Sensor - Downstream or Upstream

OE Oxygen Sensor for Toyota and Geo Applications

Walker Products OE 250-22003 is a specific-fit oxygen sensor engineered for select Toyota and Geo vehicles. It is built to provide the ECU with the exhaust feedback needed for fuel control and emissions monitoring on upstream and downstream applications.

Key Features

• Specific-fit oxygen sensor for confirmed vehicle applications
• Non-heated design with 2-wire configuration
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for direct replacement use
• Wiring harness length: 16.46 in.; overall length: 20.0 in.
• Walker Products OE line replacement for engine management and oxygen sensor service

Product Details

Walker Products OE 250-22003 is part of the Walker Products OE line, which focuses on application-specific engine management sensors built to match original equipment fitment and diagnostic feedback requirements. This oxygen sensor is used in select 1992-1997 Toyota Corolla, Toyota MR2, Toyota Celica, and Geo Prizm applications, including upstream and downstream positions depending on the vehicle and emissions package. For example, it fits 1995-1997 Toyota Corolla, upstream; 1995-1997 Geo Prizm, upstream; 1993-1995 Toyota MR2, downstream; and 1992-1993 Toyota Celica, downstream.

This part cross-references no listed aftermarket part numbers in the provided data.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Confirm the exact position before ordering, since this part is used in both upstream and downstream locations across different Toyota Corolla, Toyota MR2, Toyota Celica, and Geo Prizm applications. Inspect the sensor, wiring harness, and connector for physical damage before installation, and verify the threaded mounting point and connector style match the original unit. Because this is a non-heated, 2-wire oxygen sensor, it should be matched only to the listed applications.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company with a long history in engine management and fuel system components. The OE product line is engineered for application-specific replacement use and diagnostic feedback requirements on the listed vehicles.