This begs the question, what did she do with your keys? Did she start the vehicle or do anything with the vehicle?
Either way, we need to start with checking for codes and finding out if there are any there that would explain what is happening.
Here is a guide that will help with this:
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
If there are no codes, does the security light remain on when you turn the key to the on position?
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Saturday, December 26th, 2020 AT 5:39 PM