One problem related to vehicle overheat has been reported for the 2006 Lexus IS250. The most recently reported issues are listed below.
About 06/04/2014 while I am driving the highway as I usually do on my way to work and had made my way to the left lane. I am in rush hour traffic when all of a sudden my car started to loose compression,temp. Creazy it started to slow down to about 25 miles (while on a main highway) and a check engine light came on and the vcs notification started flashing. I immediately made my way to the shoulder on the right side of the highway to look-up the problem and did not show any thing wroung I decide to take it to longo Lexus dealer immediately after I called the service advisor he said it is commen problem for early 2006 is 250 and he said " will take care it for you under Lexus warranty" and he mension about bad ceel rings in the engine, after one day waiting, the Lexus dealer determined that my 2006 Lexus is 250 needed: valve springs, valve lash adjuster, updated pistons and rings and possibly a short block. Yes the engine was bad. But the bad news that they don"t cover because he said the car over heat!!!!!! I try to explane to him that never over heat only because that problem happened made the car heat temp. Going up and down like creazy and when I open the engine I feel no heat coming up . I think it is fair that Lexus cover all the repair for my 2006 Lexus is 250 becuse I read a lot of complaints with NHTSA had the same exactly my problem and also I see one add in craiglist the seller said that his car had same my problem and been take caed by Lexus mission vjio CA. I always take care me car as baby always maintaine and I need Lexus to fix thier bad manefacur parts in my engine.