i live in PA and now that it is colder my check engine light is coming on. i did the simple troubleshooting like the gas cap and engine caps, someone at NTB after running it told me it is the o2 sensor or the gas sensor....is that factual? anyone know what else it could be and how i can fix it?

 

Take it to AutoZone and have them scan it. Get the codes they give you and post them here and we can help you.