New X-Trail 2.0/2.5 Rear Oxygen Sensor 226A0-4CL0A 8200495791 Quality Assurance

Nissan X-Trail (X-Trail) 2.0/2.5 downstream oxygen sensor 226A0-4CL0A (OEM 8200495791), uses high-temperature ceramic probe and corrosion-resistant stainless steel housing; durable according to bench tests. It monitors oxygen content in exhaust and feeds ECU to adjust air–fuel ratio, ensuring emissions compliance and stable fuel economy. Installation is of moderate difficulty, requires disassembly of exhaust pipe section; use lifting equipment and basic tools. DIY replacement possible for skilled owners, but avoid hitting the probe. Replace if fuel consumption rises or the emission light alarm.