234-9140, 2349140, 234 9140. 2011 Lexus RX350 Base Sport Utility 4-Door 3.5L 3456CC V6 GAS. Position : Oxygen Sensor. 1XDENSO234-9140 Oxygen Sensor. DENSO Air/Fuel Ratio Sensors are manufactured and tested to the strictest OE standards for unparalleled peformance.