Industrial UpstreamDownstreamO2SensorNissanAltima25L35 Oxygen Sensor

This Industrial UpstreamDownstream O2 Sensor for Nissan Altima combines both upstream and downstream oxygen sensing in a single unit designed for 2.5L and 3.5L Altima engines. The dual-sensor configuration monitors exhaust oxygen content at multiple points in the exhaust system, providing data used to regulate the air-fuel ratio and to monitor catalytic converter performance. In operation, the upstream sensor readings help the engine control unit adjust fuel delivery, while the downstream readings offer feedback on after-treatment efficiency. This arrangement supports emissions control and stable engine performance across varying driving conditions. The part is specified for Nissan Altima models powered by 2.5L and 3.5L engines, making it a focused replacement option where both upstream and downstream oxygen sensing are involved in the exhaust stream. It is sized and engineered to align with typical Nissan Altima exhaust layouts for these engine configurations.