Right, if you have the ability to scan or can find the ability. (I have plenty of options here..and don't know your situation there) then you can view the O2 sensor and actually know if it'* working properly or not.
Under the current way this post is going, you might shotgun an O2 onto it and waste your money.
Test, diagnose and change/fix the broken part. If the O2 toggles slow then it is probably on it'* way out and needs to be replaced.
If we find out it'* just the winter blend of fuel..then we'll tell you to whine along with the rest of us.