Upstream Downstream for 01-2003 Chevy Impala 3.8L 02 O2 Oxygen Sensor 2pcs

2pcs O2 02 Oxygen Sensor Upstream&Downstream Fits 1997-2003 Buick LeSabre 3.8L

02 Oxygen O2 Sensor for 04-2005 Chevy Impala 3.8L Upstream and Downstream 2pcs

For 2005-2007 Buick LaCrosse 3.8L Oxygen O2 Sensor 02 Upstream+Downstream 2pcs

2pcs Oxygen Sensor O2 Upstream+Downstream for 02-03 Impala 3.8L Trailblazer 4.2L

Upstream+Downstream for Chevy Monte Carlo 3.8L 2000-03 Oxygen o2 02 Sensor 2pcs