If A Warning Message Is - Lexus IS250 2006 Owner's Manual

5-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warning may lead to the
system operating abnormally and possibly cause an accident. Have the
vehicle inspected by your Lexus dealer immediately.
Warning message
342
Indicates a malfunction in the TRAC, VSC or hill-
start assist control systems.
Details