Seller notes

2pcs Oxygen O2 Sensor Up+Downstream For 2010 CHEVY EQUINOX GMC Terrain 234-4251 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. * The improvement of engine performance. * Prevent premature failure of the catalytic conv...

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