Walker 350-31026 Oxygen Sensor - Upstream

Walker 350-31026 Oxygen Sensor Overview

Walker Products 350-31026 is a specific-fit oxygen sensor for older Hyundai, Mitsubishi, Dodge, and Plymouth applications that require an upstream Bank 1 Sensor 1 replacement. It is built as an OE-style engine management sensor for vehicles where accurate exhaust feedback is needed to keep the ECU informed.

Compatible With 1985-1993 Hyundai Excel, Sonata, and Scoupe; 1985-1993 Mitsubishi Galant, Mirage, Precis, Eclipse, and Van; and 1987-1990 Dodge Colt and 1990 Plymouth Laser applications listed below.

Key Features

• Part number: 350-31026
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensors
• Specific-fit design for the listed vehicle applications
• Upstream, Bank 1 Sensor 1 placement
• Non-heated oxygen sensor design
• Threaded mounting type with 18.0 mm thread diameter
• Female connector with radiused polygon shape
• 28.07 in. wiring harness length and 20-gauge wire
• Overall length: 31.61 in.

Detailed Description

Walker Products developed this oxygen sensor as a direct replacement for select import vehicles that rely on upstream exhaust feedback for fuel control and emissions monitoring. The sensor is positioned as Bank 1 Sensor 1, which means it reports the first oxygen reading before the catalytic converter so the ECU can adjust air-fuel strategy based on exhaust conditions. This part number 350-31026 is listed for non-California emissions applications across multiple Hyundai and Mitsubishi models, plus select Dodge Colt and Plymouth Laser vehicles.

Walker Products has supplied engine management components since 1946 and manufactures sensors for application-specific fitment and ECU feedback requirements. The Walker Products Aftermarket line focuses on replacement parts matched to the vehicle’s original sensor location and connector style, which is important when servicing older Hyundai Excel, Mitsubishi Mirage, or Dodge Colt oxygen sensor applications.

What It Helps Address

• Illuminated malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel correction
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Verify the vehicle’s emissions calibration before ordering, since this sensor is listed for non-California emissions applications only. Confirm upstream Bank 1 Sensor 1 placement, connector shape, thread diameter, and harness length against the original part before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since damaged wiring can shorten sensor life and affect ECU feedback.

Fits 1986-1987 Hyundai Excel, upstream; 1987-1990 Dodge Colt, upstream; 1985-1987 Mitsubishi Galant, upstream; 1987-1988 Mitsubishi Mirage, upstream; 1987 Mitsubishi Precis, upstream; 1990 Mitsubishi Eclipse, upstream; 1987-1990 Mitsubishi Van, upstream; 1989-1990 Hyundai Sonata, upstream; 1991-1993 Hyundai Scoupe, upstream; 1990-1992 Hyundai Excel, upstream; 1993 Hyundai Excel, upstream; 1990 Plymouth Laser, upstream; 1990-1993 Mitsubishi Precis, upstream.

Quality Assurance

Walker Products manufactures this sensor as an OE-replacement style component for the specified application and fitment position. The brand’s ISO 9001/TS 16949 manufacturing background supports consistent application matching for emissions and engine management service work.