Imagine this: you call the doctor and say, “Doctor, there is some sign that I am sick. Some other doctor did some stuff. Now my foot hurts. What does this mean?” You just posted the equivalent.
How about telling us what the car was doing before? What were the codes associated with the check engine light? What did the dealership actually do?
The codes have the format: P1234 There might be one or two on your invoice in which case you should report them. Of course, you may have more and/or different codes now. If you go to an auto parts chain store (such as Autozone) they will read your codes for free. Write them down and post them.
There’s no way for anyone here to get started with what you’ve asked.