Honda b18 CEL on and revs bounce?

I was in the middle of changing my fan switch when Autozone gave me the wrong one. I broke the original I had during the process and decided to just put it back in with the plastic broken, add some radiator fluid, and call it a day. When I turned the car on it took a few seconds, and after it started the CEL light is on and the revs bounce by about 300? What's the issue?

You want us to guess what code is stored in the computer, right? Ah, no. There are over 2000 possible codes. Got get your computer scanned and then you'll kNOW why the light is one.

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