Walker 250-24126 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Montero

Walker Products OE oxygen sensor Part Number 250-24126 is a specific-fit, heated upstream sensor for 1990-1991 Mitsubishi Montero applications. It is built to provide the ECU with the feedback needed for fuel control and emissions monitoring on the correct vehicle position.

Key Features

• Specific-fit oxygen sensor for upstream installation
• Heated sensor design for faster operating response
• 4-wire configuration with female connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 46.38 in.; overall length: 49.92 in.
• Walker Products OE line replacement for Mitsubishi Montero oxygen sensor service

Product Details

Walker Products OE focuses on direct replacement engine management sensors built for the application, fitment position, and diagnostic feedback expected by the ECU. This oxygen sensor is engineered for the upstream location on 1990-1991 Mitsubishi Montero models, making it a direct-match option when replacing a worn or failed sensor. The Walker Products 250-24126 is designed for threaded mounting and uses a radiused polygon connector shape with a 4-wire heated layout for stable signal delivery.

Walker Products has supplied engine management and fuel system components since 1946, and the OE line is positioned for vehicles that need application-specific sensor replacement rather than a universal part. For shoppers searching for a 1990 Mitsubishi Montero upstream oxygen sensor or a 1991 Mitsubishi Montero heated O2 sensor, this part number provides a focused fitment match.

What It Helps Address

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

Installation Notes

Confirm the upstream position before installation and verify connector style, thread diameter, and harness length against the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. This part number is intended for specific-fit replacement on the listed Mitsubishi Montero applications.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified manufacturer. The OE product line is built around application-specific replacement standards for engine management and oxygen sensor service, including the Walker Products 250-24126 for Mitsubishi Montero upstream use.