The first recall affects 2006-2008 Lexus RX 400h and 2006-2010 Toyota Highlander Hybrid models, related to an inverter issue in the car's hybrid assembly. Transistors in the assembly are subject to heat damage "due to variations in characteristics of the transistors’ parallel circuits". This damage can cause warning lights to illuminate and in most cases, Toyota says, can cause the vehicle to enter "limp home mode". In limited instances, the hybrid system can shut down, causing the car to pull to a halt.
More Lexus models are affected by the second recall, which covers around 102,000 Lexus IS 350, IS 350C and GS 350 vehicles from model years 2006-2011. In certain vehicles, bolts securing the variable valve timing control device can work loose, causing the vehicle to stop while being driven.
Toyota says that an abnormal noise can signify early symptoms of the variable valve timing device fault. Owners of all affected vehicles will be notified by first class mail.