Some 2009 – 2012 model year RAV4 and 2010 – 2011 model year Camry vehicles equipped with 2AR-FE (non-PZEV) engines may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P0138 (Oxygen Sensor Circuit High Voltage [Bank 1 Sensor 2]). This condition may be caused by incorrect air fuel ratio sensor response. The Engine Control Module/ECM (SAE Term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition occurring. Follow the Repair Procedure in bulletin T-SB-0151-18 to address this condition. The repair is to Reprogram ECM (PCM) and R & R Air Fuel Sensor with new part numbers 89467-42120 or 89467-06100. This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.