its throws a code for a 02 sensor when this light goes on. Dk exactly how they are related changed one out on an 2002 and light went away. If anyone knows please let me know how they are related.
I've Read this and took it from there and it worked:
SOURCE: VSC TRAC, TRAC OFF and CHECk ENGINE lights
You have to know what code is stored to fix the problem. Toyota's will generally display a Check Engine light, VSC and TRAC light all at the same time, even if it's a simple problem with an oxygen sensor (for example). You can disconnect the negative battery cable for a few minutes, even though you should a scan tool should be used, to clear out the code