4PCS OEM Upstream & Downstream Oxygen O2 Sensor For Chevy GMC Buick V6 3.0L 3.6L

For 2005-2008 Buick Lacrosse V6 3.6L - Downstream. for 2005-2006 Buick Rendezvous V6 3.6L - Downstream. for 2004 Cadillac CTS V6 3.6L - Downstream. for 2014-2016 Cadillac ELR L4 1.4L - Downstream. for 2004 Cadillac SRX V6 3.6L - Downstream.