It looks like this problem is getting bigger by the day :o .
I have had my IS220 for 6 months and put 25k on the clock in this time the VSC warning lights have come on 4 times.
The first time was put down to dodgy fuel, the second time was a faulty sensor, the third time the ECU and 5th injector was replaced. This time the light came on I phoned the dealer and was told to get it recovered back to my local Lexus dealer(all other times I was told to drive it in). This was done to make sure Lexus technical got involved as the dealer had done every thing possible to fix the car. I was given a golf to drive (delivered to me at work)for 2 days until a top spec GS300 was available. The dealer has been excellent throughout this recurring fault and have always given me good cars until my one was fixed (4 days was the longest to-date).
I have now told them that I want a car that actually works correctly even if this means a replacement car and will keep you all informed if I get any info ;) .
I am gutted the car keeps failing and hope they find a permanent fix ASAP (although I never need to wash and clean it as Lexus keep it clean)