still getting po 1647 code after i changed my upstream 02 sensor

 

danoc22, lets help you get to a solution on this. The first question that I have to ask is whether you bought an O2 sensor that you had to add the plug or if it came with a plug already attached. I have seen lots of people have problems with the generic sensors that you have to attach your own plug. After this, are you sure that you have 12 VDC going to the heater itself in the sensor? Odds are, the fuse is fine because you are not getting codes on the other sensors (they all share a common fuse). But, it is possible that the wiring between the fuse box and the sensor has an issue. If you tell me the year of your car, I can tell you the wire colors to measure. If you have a 2004, then I need to know the build month/year (written in the driver's door jam).

If the wiring checks out, then the other potential is you have a bad ECM.