What triggers check engine soon light to come on on a 2000 continental?

Many things can trigger a check engine light in every car. There are many engine sensors that can fail or detect and issue and set a trouble code. Best bet is to have the system scanned. Auto parts stores will do a basic scan for free but a professional shop is recommended. You can also start by making sure your gas cap is on tight. That can set the light as well. Here is a link to find a shop near you. https://repairpal.com/repair-shops Alex