I strongly recommend having Advance Auto Parts or Autozone scan your Corolla's onboard computer to check for the trouble codes that tripped the check engine light. It might be totally unrelated to the work you did. Also, if you live in a state that has annual safety/emissions inspections, just because the check engine light is off it still wont pass the emissions inspection, as the check engine light trouble code is stored in the cars onboard computer. It needs to be scanned, the trouble codes retrieved and then cleared.