Walker 250-241099 Oxygen Sensor - Upstream

Walker Products OE 250-241099 Oxygen Sensor

Walker Products OE 250-241099 is a heated upstream oxygen sensor built for specific vehicle applications. It is engineered as an OE-style replacement that delivers the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit application for direct vehicle matching
• 4-wire design with 20-gauge wiring
• 11.34-inch wiring harness length and 14.88-inch overall length
• 18.0 mm thread diameter with flange mount design
• Radiused polygon connector shape with male connector gender

Fitment Details

• Fits 1998-2002 Chevrolet Prizm, upstream. Bank 1 Sensor 1 requires an upstream oxygen sensor; Walker Products OE.
• Fits 1998-2002 Toyota Corolla, upstream. Bank 1 Sensor 1 requires an upstream oxygen sensor; Walker Products OE.

This Walker Products OE oxygen sensor, part number 250-241099, is built for upstream placement on select Chevrolet Prizm and Toyota Corolla models. As an engine management sensor, it helps the ECU monitor exhaust oxygen content so the vehicle can adjust air-fuel strategy and maintain emissions system performance. The specific-fit design supports correct sensor location and connector matching for the listed applications.

Walker Products OE focuses on replacement sensors for original equipment-style fitment across many vehicles worldwide. For this application, the sensor is configured for upstream use and is intended to match the required diagnostic feedback for the engine control system. Part number 250-241099 is also referenced as 250-241099 when comparing listings for the same application.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the upstream mounting location, 18.0 mm thread size, and flange mount style match the vehicle before installation. After installation, clear any stored fault codes and verify that the ECU reads the new sensor correctly.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates under ISO 9001/TS 16949 quality systems. The OE product line is built around application-specific fitment and diagnostic feedback requirements for modern engine control systems.