The repair had done a poor job, the check engine light is on again

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Oh my gosh, the check engine light of the car is on again, and it is Sunday, I couldn't do anything since the shop is closed. On Friday, my car was dead, and I had it towed to the repair shop to get it fixed. They told me the alternator is dead, and I need to replace another one. I paid $500 for it, and after they get it fixed. After 2 days, the Check Engine light is on again. I have to work tomorrow morning, and I afraid the car might fail on the way to work. Gosh, those mechanic really done a poor job, and I have to bring back my car to have them check it for me one more time. That just stress me out again.