2pcs Up+Downstream Oxygen Sensor Fits For 2007-2013 Nissan etc Fit for: For 2007-2013 Nissan Altima 2.5L For 2008-2013 Nissan Rogue 2.5L Specification: OE??234-4190, 234-9036 Note: Please confirm the OE number before purchasing! Features: *Function 1.The front oxygen sensor is to detect the air-fuel ratio of the engine in different working conditions. 2.The rear oxygen sensor is mainly to detect whether the three-way catalytic converter works normally. * 100% test before shipment. * The reduction of harmful emissions. * The increasing of fuel economy. .