Walker Products 350-34998 Direct Fit Narrow-Band Oxygen Sensor - 4-Wire

The Walker Products 350-34998 is a 4-wire, narrow-band, direct-fit replacement oxygen sensor (O2 sensor) engineered to meet or exceed original equipment manufacturer (OEM) specifications. Manufactured to the exact form, fit, and function of the factory sensor, this direct-fit design installs with the OE-matched connector — no splicing or manual wiring required.

The oxygen sensor monitors exhaust gases and sends a voltage signal to the engine control module (ECM), which uses that data to continuously adjust the air-fuel mixture for optimal combustion efficiency. A failing O2 sensor can lead to poor engine performance, increased fuel consumption, elevated exhaust emissions, or an illuminated malfunction indicator light (MIL/Check Engine light).

Key Features:

• 4-Wire Design: Narrow-band sensor with integrated heater circuit for fast warm-up and accurate readings
• Direct Fit: OE-matched connector plugs in directly — no cutting or splicing
• OEM-Quality Construction: Engineered to meet or exceed OE specifications for reliable, long-lasting performance
• Application-Specific: Manufactured for the specific vehicle application and exhaust position
• Anti-Seize Included: Thread anti-seize compound included for proper installation
• ISO 9001 / TS 16949 Certified: Produced under stringent automotive quality management standards
• Extensive Testing: Each sensor undergoes rigorous testing to ensure accuracy and durability

Walker Products has been a trusted name in engine management sensors and fuel system components since 1946. The 350-34998 is part of their comprehensive OEM-replacement O2 sensor program, designed to restore proper ECU feedback and keep your vehicle running efficiently.