4Pcs Up & Downstream Oxygen O2 Sensors For BMW 128I 325XI 528I X3 X5 Z4 234-5138 Fit for: BMW 1 SERIES M L6-3.0 2011 Cylinder 1-6 ; 2 Upstream & 2 Downstream BMW 128I L6-3.0 2013-2008 Cylinder 1-6 ; 2 Upstream & 2 Downstream BMW 135I L6-3.0 2010-2008 Cylinder 1-6 ; 2 Upstream & 2 Downstream BMW 323I L6-2.5 2011-2010 Cylinder 1-6 ; 2 Upstream & 2 Downstream BMW 325I L6-3.0 2006 Cylinder 1-6 ; 2 Upstream & 2 Downstream BMW 325XI L6-3.0 2006 Cylinder 1-6 ; 2 Upstream & 2 Downstream BMW 328I L6-3.0 2013-2007 Cylinder 1-6 ; 2 Upstream & 2 Downstream .
