Hello, currently working on ford focus, 2013, 2.0L direct injection. Im having p2196 fault- running rich. I checked for air, vacuum leaks- everything seems okay. Tried to change o2 sensor- no luck. LTFT stays at 0, STFT also stays at 0, but sometimes jumps to negative 29 and stays for a couple of minutes, then goes back to 0. What im missing,what could be the cause of running rich?

 

It might help if you could post the data stream info so we might get some idea of just what is going on. Can we do this?