2012 Corolla OBD Code P219A

#1
I have a 2012 Corolla LE, bought used with 46k in September 2013. Since about the 3rd week of ownership, the Check Engine light will come on and off sporadically, which disables the traction control and cruise. I had an OBD scan done, it's pulling P219A which is Bank 1 Fuel/Air Ratio Imbalance. It seems like whenever I get to below a 1/2 tank the light comes on, after I fill up, after a couple of starts, it goes off til the next time. What is the most LIKELY cause of this? Thanks.
 
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