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Hi Jenny, Sorry to hear your distress! When the check engine light comes on it generates a fault code, this will assist in pointing a mechanic in the right direction of where the fault is! You cannot just reset the light and hope the fault disappears! The garage that did the work needs to find the reason the light is on and put the fault right since it is their responsibility to give the car back with no lights on the dash!
First, a bad battery doesn't turn the light on. Just A bad alternator or ECM. Start the car. put a volt meter on the + and - sides of the battery. If it reads 12 to 15 volts (closer to 15 for a new alternator). The alternator is good. And is charging. The problem is the wiring or the ECM. It can be bypassed to turn the light off. I just did it a week ago. Problem is , I don't have the wiring diagram for your car. Don't get a book from the parts store, it won't tell you. Go to alldata or Mitchell and purchase a manual. It's online and lasts a year. But they give you good electrical schematics...
With a multimeter check the voltage at battery terminals. Should be more than 12.6Volts when engine off, and at least 14 volts with engine on. If the battery voltage is less than 12.6 volts then you need a new battery. If the voltage is less than 14 Volts with running engine, then the alternator is not working properly. A stop at AutoZone might help. They scan codes, and check alternators for free.
sounds like a dead battery. Does it run while it is hooked to jumper cables and then die when they are disconnected? If so then you could have a dead alternator as well. The battery is primarily used to start the vehicle and then run all the electrical options. The alternators job is to recharge the battery and run the engine.
had the eact same thing happen on my diesel and it turned out to be the alternator which had fried oine of the batteries.... you could put a charge on them and it would run for a week or ten days and then nothing.. clean the cables charge it up and it would go again... finally it just stop taking the charge and I look deeper and replaced the batteries ran fine for two weeks then dead again... alternator finally finished itself off... problem had been a little intermittent till then.. good luck