I had the same issue. Bought my car 2 weeks ago, have less than 1k .. and Check ENGINE, VSD light came on.
I took it to the dealer; he initially checked the gas cap which was shut air tight .. then they took it inside and I am pretty sure that they probably reset the cpu. Now my question is, Are you putting premium gasoline or just regular 87 ? Let me know what grade of gasoline do you use ?
**This is my first Lexus, less than 2 weeks old and already a freaking ENGINE sign**
I don't know if I am so sure about the brand now.