Two problems related to tire tread/belt have been reported for the 2004 Lexus SC430. The most recently reported issues are listed below.
I have an Lexus Sc430 2004 with 40k miles on it. I have repeatedly put new tires on the car. The dealership is telling me, that's the way the tires are going to wear because its a so call sports car. The tires is wearing down to the wire on the inside of all the tires about every 7,000-8,000 miles. It's not safe and it's $356 a tire.
On March 7, 2005 the caller was traveling at 75 mph and without warning a tire separated from the rim about 2 inches. He said it happened again on September 10, 2005. He was going about 70 mph. It happened both times to the driver's side. Dealer asked, the first time, if he hit something and they fixed it by giving him a new rim and tire. Dealer has vehicle now for the second time. Manufacturer has not been contacted yet.