Walker 250-21061 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Ram 50 and Mighty Max

Walker Products OE 250-21061 is a specific-fit, non-heated oxygen sensor built for upstream Bank 1 Sensor 1 applications. It is listed for 1990 Dodge Ram 50 and 1990 Mitsubishi Mighty Max models without California emissions certification, making it a direct-match option for the correct emission package.

Key Features

• Specific-fit oxygen sensor for upstream installation
• Non-heated design with 1-wire construction
• Threaded mounting with 18.0 mm thread diameter
• Female connector with radiused polygon shape
• Wiring harness length: 15.28 in.; overall length: 18.82 in.
• Walker Products OE line replacement for engine management and oxygen sensor service

Product Details

Walker Products OE 250-21061 is engineered as an OE-style replacement oxygen sensor for vehicles that require upstream feedback to the ECU. The sensor is designed for the 1990 Dodge Ram 50 and 1990 Mitsubishi Mighty Max in non-California emissions configurations, where accurate exhaust monitoring helps the engine control system manage fuel delivery and emissions. This part number, 250-21061, is built for the specified application and fitment position rather than universal use.

The Walker Products OE line focuses on application-specific engine management sensors, with each part matched to the vehicle position and diagnostic feedback requirements. For Ram 50 and Mighty Max owners, that means a sensor selected for Bank 1 Sensor 1 upstream service on the correct emissions package. This part cross-references no listed interchange numbers in the provided data.

What It Helps 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 signal input
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the oxygen sensor circuit

Installation Notes and Tips

Confirm the vehicle is a non-California emissions application before ordering. This oxygen sensor is listed for upstream Bank 1 Sensor 1 placement on 1990 Dodge Ram 50 and 1990 Mitsubishi Mighty Max models. Inspect the sensor wiring harness and connector for damage before installation, and verify the threaded mounting point and connector style match the original part.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacements and manufactured under ISO 9001/TS 16949 quality systems. The brand has supplied engine management and fuel system components since 1946.