Nissan Sunny N16 oxygen sensor 22690-4M500 / 22690-40U06 dual-number universal

This oxygen sensor directly replaces Nissan original numbers 22690-4M500 and 22690-40U06; the two numbers are interchangeable and require no wiring changes after installation. It monitors exhaust oxygen content and sends signals to the ECU to adjust fuel injection for engine efficiency. Fits Nissan Sunny (N16) 1.5L and 1.8L engines. If idle is unstable, fuel consumption rises, acceleration is weak, or the check engine light is on, sensor aging is likely; replacement restores power, improves fuel economy, and meets emission standards.