Walker 250-21005 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor 250-21005

Walker Products OE 250-21005 is a specific-fit oxygen sensor for older Mitsubishi, Dodge, Chrysler, Plymouth, and Hyundai applications that require an upstream, non-heated sensor. It is built to deliver the ECU feedback needed for proper fuel control and emissions monitoring on the listed vehicles.

Key Features

• Specific-fit oxygen sensor for the listed applications
• Upstream position for Bank 1 Sensor 1 service needs
• Non-heated sensor design
• Threaded mounting with 18.0 mm thread diameter
• Female connector with radiused polygon shape
• 17.44 in. wiring harness length and 20-gauge wire
• Overall length: 20.98 in.

Walker Products OE Line Details

Walker Products OE focuses on original-equipment-style replacement sensors engineered for application-specific fitment and diagnostic feedback. The 250-21005 follows that approach for vehicles that need an upstream oxygen sensor to help the ECU monitor exhaust oxygen content and adjust engine operation accordingly.

Detailed Description

Use Walker Products OE part number 250-21005 when replacing an upstream oxygen sensor on select 1983-1993 vehicles, including Mitsubishi Galant, Dodge Raider, Dodge Ram 50, Mitsubishi Mighty Max, Mitsubishi Montero, Mitsubishi Cordia, Mitsubishi Tredia, and related Chrysler, Plymouth, and Hyundai applications listed in the fitment data. This oxygen sensor is designed for specific locations and emissions configurations, including Bank 1 Sensor 1 service on non-California emissions vehicles where noted. For shoppers searching for an upstream oxygen sensor for a 1993 Mitsubishi Galant, a 1984-1989 Dodge Ram 50 oxygen sensor, or a 1983-1989 Mitsubishi Montero upstream sensor, this part number provides the correct application-focused replacement.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946 and manufactures parts under ISO 9001/TS 16949 quality systems. Part number 250-21005 is built to support the diagnostic feedback expected by the ECU on the covered vehicles, helping maintain proper sensor reporting for fuel and emissions control.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel control
• Higher exhaust emissions from a worn upstream sensor
• Fault codes tied to Bank 1 Sensor 1 or upstream sensor circuits

Installation Notes and Tips

Confirm the vehicle’s emissions configuration, model year, and sensor position before ordering. This part is listed for upstream locations only and is not universal. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect operation. Verify the threaded mounting style and connector shape match the original sensor on the vehicle.

Quality Assurance

Walker Products OE sensors are manufactured as OE-style replacements for specific applications and are backed by the company’s long-standing focus on engine management components. Part number 250-21005 is produced under Walker Products’ ISO 9001/TS 16949 quality framework.