About a month ago I was driving and the "check engine" light lit up yellow. It stayed lit for a month whenever I drove but I never got around to taking it to the repairman to see what was wrong. Now since yesterday the light stays off when I drive. I know the light is still working, as it lights up with all the other lights when I turn the key to the "on" position. Also I know that a warning light sometimes occurs for even the slightest problem in a car's detection system. Is there a chance that the problem that caused it to light up went away on it own? It's a 1999 Acura Integra LS. I could ask a dealership but they will probably lie to get a buck out of me. So maybe one of you grease-monkeys knows the answer.