Walker 350-34398 Oxygen Sensor - Downstream or Upstream

Walker 350-34398 Oxygen Sensor Overview

Walker Products 350-34398 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Mitsubishi, Dodge, and Ram 50 applications. It is engineered to deliver the ECU feedback needed for proper fuel control, emissions monitoring, and fault-code diagnosis.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34398 follows that approach with the correct threaded mounting, connector style, wire count, and harness length for the listed vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for direct application matching
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with female radiused polygon connector
• Wiring harness length: 21.18 in.; overall length: 24.72 in.
• Built for ECU feedback on emissions and fuel-trim control
• Walker Products part number 350-34398

Detailed Description

This Walker oxygen sensor is designed for vehicles that rely on accurate exhaust-gas feedback to manage air-fuel ratio and emissions performance. On the listed Mitsubishi Eclipse, Mitsubishi Mighty Max, and Dodge Ram 50 applications, the sensor supports the ECU by reporting oxygen content changes so the system can adjust fueling and monitor catalyst-related operation. The 350-34398 is a practical replacement when the original sensor has aged, wiring has been damaged, or diagnostic trouble codes point to sensor circuit or response issues.

Walker Products Aftermarket builds this sensor as an OE replacement for specific positions, including upstream and downstream locations depending on the vehicle and emissions package. For fitment-based searches, this part covers 1990-1994 Mitsubishi Mighty Max upstream oxygen sensor applications, 1998-1999 Mitsubishi Eclipse downstream oxygen sensor applications, and 1990-1993 Dodge Ram 50 upstream oxygen sensor applications. The part number 350-34398 is also referenced for select California emissions and California-ESV configurations.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Higher fuel consumption from inaccurate exhaust readings
• Increased exhaust emissions from a failing sensor
• Fault codes stored in the ECU for sensor or related circuit issues

Installation Notes and Tips

Verify the vehicle’s year, make, model, emissions package, and sensor position before ordering. This part is a threaded, specific-fit sensor, so connector shape, wire count, and harness length should be matched to the original unit. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since damaged wiring can shorten sensor life and affect readings. Confirm the upstream or downstream location on the vehicle before replacement.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates with ISO 9001/TS 16949 certification. The 350-34398 is manufactured for the listed application and position to provide the diagnostic feedback expected by the ECU.