why would my check engine light be on if things were changed and reset .

on 1999 Dodge Stratus

I changed the air filter , the spark plugs in wires, also the O2 sensor and gas cap. what else can be keeping my check engine light on.

Asked by for the 1999 Dodge Stratus
agree with could be circuit issues and not sensor malfunction
1 more answer
Lots of differant yourself further frustration and get it diagnosed.