Lexus has announced a voluntary safety recall on the 2004-2005 ES 330, 2004-2005 RX 330, and the 2006 RX 400h to replace the crankshaft pulley — here are the technical details pulled directly from the press release:
There is a possibility that the outer ring of the crankshaft pulley may become misaligned with the inner ring, causing noise and/or illumination of the discharge warning light. If this condition is not corrected, the belt for the power steering pump may become detached from the pulley and the driver may notice a sudden increase in steering effort. There are no reports of accidents or injuries related to this condition.
137,000 Lexus vehicles in the USA are affected — owners will be notified by mail, and repairs are scheduled to start in January 2012.
Update: Lexus has since released an informative Q&A regarding this recall.