Walker 350-34298 Oxygen Sensor - Upstream

Walker Oxygen Sensor for Hyundai and Mitsubishi

Walker Products part 350-34298 is a heated upstream oxygen sensor built as an OE-style replacement for specific Hyundai and Mitsubishi applications. It is engineered for the vehicle’s original sensor location and provides the ECU with the feedback needed for proper fuel control and emissions monitoring.

For drivers diagnosing a check engine light, poor fuel economy, or elevated exhaust emissions, this Walker oxygen sensor offers a direct-fit solution for select Hyundai Sonata, Hyundai Elantra, Hyundai Excel, and Mitsubishi Precis models.

Key Features

• Walker Products Aftermarket oxygen sensor, part number 350-34298
• Heated sensor design for upstream Bank 1 Sensor 1 applications
• Specific-fit replacement for the listed vehicle applications
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 10.35
• Overall length: 13.9
• Radiused polygon connector shape

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as replacement parts for original equipment applications. Part 350-34298 is built for upstream installation and is intended to deliver the diagnostic feedback the ECU expects from the sensor location. The design supports emissions control and air-fuel monitoring on vehicles that use a heated oxygen sensor in the upstream position.

This part cross-references common OE-style replacement applications for the same vehicle coverage. If your vehicle is showing fault codes tied to the upstream sensor circuit, this sensor is a direct replacement option for the specified Hyundai and Mitsubishi models.

What It Can Help Resolve

• Check engine light related to upstream oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Reduced fuel economy from inaccurate exhaust readings
• Higher exhaust emissions from a failing sensor
• Fault codes stored in the ECU for Bank 1 Sensor 1

Installation Notes and Fitment

Fits 1996-1998 Hyundai Sonata, upstream. Fits 1997-1998 Hyundai Sonata, upstream for non-California emissions vehicles, Bank 1 Sensor 1. Fits 1994-1995 Hyundai Sonata, upstream for non-California emissions vehicles and California emissions ESV applications. Fits 1996 Hyundai Sonata, upstream for Bank 1 Sensor 1.

Fits 1995 Hyundai Elantra, upstream. Fits 1994 Hyundai Elantra, upstream for California-ESV and non-California emissions applications. Fits 1993 Hyundai Elantra, upstream for California-ESV and non-California-ESV applications from 7/1/93. Fits 1994 Hyundai Excel, upstream and 1993 Hyundai Excel, upstream for California-ESV and non-California-ESV applications from 07/16/93. Fits 1992 Hyundai Excel, upstream for California-ESV applications. Fits 1994 Mitsubishi Precis, upstream and 1993 Mitsubishi Precis, upstream.

Before installation, inspect the sensor wiring harness and connector for damage, since physical wear can shorten sensor life and affect ECU feedback. Confirm emissions calibration and application notes before ordering, especially for California and non-California variants.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures this sensor as an OE-style replacement for the listed applications. The company is ISO 9001 / TS 16949 certified, with production focused on application-specific fitment and diagnostic performance.