hi!, first engine light is a drivability code retrival, you can pass a e-chek, (emmision test) and have problems, likewise no light and fail, I've been in that situation 2 x's. hope you live were a ADVANCE auto parts is, they can for free do all cars, they have a technicions grade scan tool , zone doesnt. and free, needs done and let me know if they are vague on how to or what to do after, i'll help. Thwy do aLL foreign and 81 up all makes OBD1 and all makes OBD2 and all global test a new thing beyond obd2 that old school techs dont know yet, unless they are current techs at a dealer only, the places you went to I dont believe there at that point yet, thankyou, Tim