I have a 2004 Sable with the DOHC engine. I put gas in my car the other day and forgot the gas cap...the plastic tether broke. While driving to work today I finally realized when the check gas cap light came on I left my gas cap behind. I had to get to work today so I drove my car 100 miles with no gas cap. I live close to work but had to drive to work from far away today. I got a new gas cap and the light for the gas cap has not gone off yet. I have only driven the car about 5 miles since the new gas cap was put on. When will the gas cap light go out? Can I reset the gas cap light? Did I damage my car by driving with no gas cap?