l have a 2003 IS300 with 103,000 miles. Suddenly today the TRAC OFF light started to blink and the check engine light went on...it happened while l was cruising on the highway. Would it be okay to drive it this weekend..until l can take it to the dealer on Monday?

You should be fine to drive your vehicle if you do not notice any driveability issues such as lack of power, and the
check engine is not blinking (This means a cylinder is dead and the vehicle is experiencing a rich condition. On some model lexus the traction, vsc light will illuminate when the check engine light is
on. More than likely you have an emissions related issue.

yeah, you can drive it this weekend to the Lexus dealer to get it looked at. :p

No one can tell you exactly what is happening without putting a reader to it and seeing what error code comes up. l could say, hey, no shake it is great. but you go 10 miles and you're engine blows.