Chrysler Repair: Engine Light, chrysler sebring, service engine soon light

Question
QUESTION: Today I drove my car a 1999 Chrysler Sebring about 8  miles with no problems, when I started it up to leave the SERVICE ENGINE SOON light was on and as I was backing up you cou feel a vibratio. On the way home the light would start flashing. Any clue how bad this might be?

ANSWER: need to get the code for the light scanned.

---------- FOLLOW-UP ----------

QUESTION: Ok, so I made an appointment to have a diagnostic scan run on Monday but last night I drove the car up the road and back and the service engine soon light went out so what should I do.  I've heard that it will go out if no problem is again detected and also that the scanner won't pick anything up if the light is not on.  Please help.  Thanks

Answer
the codes are stored in the computer for 40 starts after it goes off. IF the light is off the computer was looking for the same issue to happen  and it saw it not happen 3x so it turned it off.  U can have codes scanned for free at places like auto zone and advanced auto.