well it did run kinda low, not dangerously though, several months back but was immediatly taken care of, i had just had it serviced like a week before the light came on, and now it smells like something is burning....what can i do to check on these things, my mechanic said something bout a carbon buildup....but from what ive seen on the forums and this post that doesnt seem it at all so im not too sure i trust my mechanic now..