4pcs Upper + Lower For 03-05 Chevrolet Tahoe GMC Yukon 4.8L 02 Oxygen O2 Sensor

Compatibility: 2003-2006 Chevrolet Silverado 1500 4.3L 2003-2005 Chevrolet Silverado 1500 4.8L 2003-2005 Chevrolet Tahoe 4.8L 2003-2006 GMC Sierra 1500 4.3L 2003-2005 GMC Sierra 1500 4.8L 2003-2005 GMC Yukon 4.8L Q&A: Q:What is Differences Between upstream and downstream O2 Sensor? .