Up+Downstream New Oxygen Sensor 4PCS For Lexus GS350 IS250 2006-2008RWD IS350
234-4521: 1PCS Downstream Rear; Bank 1 Sensor 2;. 234-4521: 1PCS Downstream Front; Bank 2 Sensor 2. For Lexus > GS350 > 2007 > 3.5L V6 > RWD. For Lexus > GS350 > 2008 > 3.5L V6 > RWD; To 02/2008. For Lexus > IS250 > 2006 2007 > 2.5L V6 > RWD.