I have A 2003 LS430 and all of a sudden the the VSC light came on the dash? Any ideas why,and is it dangerous?:

 

Mine came on when I had a misfire code. I have the same year and model. Also that light is accompanied by my check engine light and the red alert arrow. I replaced a fouled out spark plug and all better. As far as dangerous I don't know. My car would rattle but that's because it was misfiring it would reset and come back on every few hours before I had it fixed.

 

Mine came on, trac off and the CEL also came on. It turned out to be a loose Gas Cap.

 

Thank you both. I,m sure its like Im2nc3 says ,erractic miss etc.