Walker 350-31003 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for Ford, Kia, Mazda, and Mercury Vehicles

The Walker 350-31003 oxygen sensor is designed to provide accurate emissions monitoring for specific vehicle models including Ford Escort, Kia Sephia, Mazda MX-3, and Mercury Tracer. This non-heated sensor ensures precise air-fuel mixture readings to help maintain optimal engine performance and emissions control.

• Wiring harness length: 16.46 inches for flexible installation
• Wire gauge measurement: 20 gauge for reliable signal transmission
• Non-heated sensor type for specific engine applications
• Single wire quantity simplifies connection
• Radiused polygon female connector for secure fit
• Thread diameter of 18.0 mm with threaded mounting type
• Overall length of 20.0 inches for proper reach

Walker Products Aftermarket Line Overview

This oxygen sensor is part of the Walker Products Aftermarket line, which focuses on providing quality emission control components tailored to specific vehicle applications. The 350-31003 sensor is engineered to meet OEM specifications for fit and function, ensuring compatibility with select Ford, Kia, Mazda, and Mercury models. Walker Products Aftermarket parts are designed to support emission system integrity and regulatory compliance.

Product Details and Compatibility

The Walker 350-31003 oxygen sensor is a non-heated, threaded sensor with a radiused polygon female connector, designed for specific fitment rather than universal use. It is compatible with Ford Escort and Tracer, Kia Sephia and Festiva, Mazda MX-3 and Protege, and Mercury Tracer models. The sensor’s 16.46-inch wiring harness and 20-inch overall length provide adequate reach for installation in these vehicles. The 20 gauge wire ensures consistent signal quality for accurate oxygen level detection.

Common Applications and Issues Addressed

• Helps maintain proper air-fuel ratio for efficient combustion
• Reduces harmful emissions by providing accurate sensor data
• Prevents engine performance issues related to faulty oxygen sensors
• Supports emission system diagnostics and compliance
• Addresses check engine light triggers related to oxygen sensor faults

Installation Notes and Tips

Installation requires removal of the old oxygen sensor and threading the Walker 350-31003 sensor into the exhaust manifold or pipe. Ensure the connector matches the vehicle’s wiring harness with its radiused polygon female design. Use appropriate tools to avoid damaging the 18.0 mm threaded mounting. Verify wiring harness length and routing to prevent strain or interference with other components.

Quality Assurance and Warranty

Walker Products Aftermarket oxygen sensors are manufactured to meet industry standards for durability and performance. While specific warranty details for part number 350-31003 should be confirmed with the supplier, Walker typically offers coverage against defects in materials and workmanship to support long-term reliability.