Hello, i have a 2002 dodge dakota and its just acting weird. It will drive good, but then when it starts to get hotter in temp it will not run good at all. It will bog all the way down and even when i put my foot to the floor it will just bog and clank and make all kinds of weird noises. The O2 sensor is on, could that be the problem for it to do this

 

If you have an O2 code then yes, it should be replaced as it's not reading the fuel/air mix correctly. Replace them with factory sensors, not the cheap parts store ones. Youshould see a nice jump in mileage with the new sensors.