Mitsubishi Repair: ECU, 2003 mitsubishi galant, mitsubishi galant

Question
2003 Mitsubishi Galant, Service Engine Soon Light comes on what dose this mean.

Answer
Barry,
When the Service Engine Soon light comes on, it typically means your ECU detected a problem with one or more of your emission components or sensors.  If you have an AutoZone in your area, they can scan your ECU for trouble codes for free.
Good luck!