Amazon.com: 2 Pairs Upstream and Downstream Oxygen Sensors O2 Sensor for BMW 2006-2003 325I 330Ci 330I 525I 2.5L 3.0L Front and Rear 4pcs O2 sensor 234-5137 234-4473 : Automotive
Amazon.com: Guniang Set of 4 Oxygen O2 sensor for 2009 2010 BMW 535i xDrive 3.0L, 2008 BMW 535xi 3.0L Upstream + Downstream : Automotive
Amazon.com: Guniang Set of 4 Air Fuel Ratio Oxygen O2 sensor for BMW 328xi 2007-2008 3.0L BMW 328i xDrive 2009-2013 3.0L Upstream + Downstream : Automotive
Amazon.com: A-Premium O2 Oxygen Sensor Replacement for BMW 325Ci 325i 330Ci 330i 2001-2002 323Ci 328Ci 323i 328i 325xi 330xi X3 X5 Z3 Z4 Upstream and Downstream 4-PC Set : Automotive
Amazon.com: Germban 11787570104 5-Wire Wideband O2 Oxygen Sensor Upstream Fits for BMW E81 E90 E93 E92 E91 0258017131 : Automotive
Amazon.com: Bank 2 Pre-Cat Oxygen Sensor Compatible for BMW 128i 135i 323i 325i 328i 330i 335i 525i 528i 530i X3 Z4 N52 N54 3.0L E70 X5 4.8L : Automotive