Walker Products 250-25121 Wideband Oxygen Sensor 5-Wire O2 Sensor

The Walker Products 250-25121 is a 5-wire wideband oxygen sensor (O2 sensor) engineered as a direct OE replacement for a precise vehicle application and exhaust position. Wideband sensors deliver a broader and more accurate measurement of the air-fuel ratio compared to traditional narrowband sensors, providing the engine control unit (ECU) with the detailed feedback it needs to optimize combustion, fuel economy, and emissions output.

Key Features:

• 5-Wire Wideband Design: Advanced wideband technology for precise, real-time air-fuel ratio monitoring across a wide lambda range
• OE Fit, Form & Function: Engineered to match the original equipment sensor in connector type, thread size, wire length, and signal output
• 100% Performance Tested: Every unit is assembled and tested in the USA before leaving the facility
• Corrosion-Resistant Construction: Built to withstand harsh exhaust temperatures and environments for long service life
• Platinum-Coated Electrode: Gas-permeable platinum electrode construction enables accurate voltage generation and rapid response to changes in exhaust oxygen levels
• ISO 9001 / TS 16949 Certified Manufacturing: Produced under stringent automotive quality management standards

A failing wideband oxygen sensor can trigger a malfunction indicator light (MIL/Check Engine light), cause rough running, increase fuel consumption, or elevate exhaust emissions. When replacing, it is also recommended to inspect the wiring harness and connector for physical damage. Walker Products has been a trusted supplier of engine management sensors and fuel system components since 1946.