my service engine soon light comes on about once a week..and comes and goes..i brought it to the dealer, and they said it was a mis-fire, and that when i brought it in for service that they would fix it...but now the light still comes on about once a week..somebody told me that it might just be a bad sensor....is there anything i could do about this? or to just stop the service engine soon light coming on..cause i always bring to the dealer for them to turn it off...is there anyway i could do it..