Engine light on and fog up inside when car off?

Hi there, I saw you answer a question on here that I think may be the same issue I am having with my car. Today I was driving, and my check engine light came on. When I got to work and came out at the end of the day the car was fogged up on the inside. I got home and I just went back out and saw it’s Al starting to fog up again on the inside. I also have noticed for months on the right passenger side the floor gets wet under the mat. I just had it for an oil change at the end of November and asked them to take a look, but they said it was okay but bring it back if I have issues. I am going to take it back to a shop this week and hope to get in by Friday but want to know if it is something you think is so urgent, I should not drive my car at all? I do drive about 20 minutes to and from work a day. Also, any insight into what you think the issue may be is very helpful in case they cannot figure it out.