I hit a speedbump and the wiring on my UEGO sensor got scraped off. It worked fine for a few days but then froze at 14.7 while driving. I got a brand new replacement sensor and per AEM did NOT do a free air calibration. The sensor stays at 14.8 or sometimes goes to 14.7 when the car is on. The connectors were not remotely damaged at all just the tip of the 02 just where metal becomes the wire loom. I checked the back of the gauge and everything is snug. What could be the problem?

 

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My gauge reads that when its not pluged into the rest of the unit, for example just wired in for the display.

 

sounds like a loose connection, if it were your o2 it would read stagnent. are you sure your connections to the 02 are good?