...computer codes(in Jamaica)!Help!? I live in Jamaica and so fancy computer based diagnostics or code checks are unavailable. This is old fashion trial and error. What can I do to fix this? The light came on after a semi-mechanic came to fix my car horn and clean A/C vents. He added water to the battery. Then light went on during a short trip down the road...on a small patch of bumpy road it went off but returned approximately 1 minute later. Ironically I had just commented an how good the car has been running lately...can anyone make suggestions please! Car makes no unusual sounds runs good still etc..Help!