Features: * 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 converter. Specification: Condition: 100% Brand New Product Name: Oxygen Sensor Install Position: The upstream oxygen sensor is located in front of the catalytic converter; the downstream oxygen sensor is located after the catalytic converter Replacement: Direct Plug-In Replacement OE Part Number: 15156, 15564, 234-4342, 234-4668 Fitment: For Chevrolet Silverado 1500 5.3L 2003-2005 .
