2009 Impala 3.5 flex fuel. How do I fix a high alcohol content reading 78% besides resetting the ecu. Is there a part I can replace

What is your question?

I have ran a tec2 and reset the parameters on it and yet shortly after I do it goes back to reading high alcohol 78% again please help

What makes this problem better or worse?

I have never ran e85

How long has your 2009 Chevrolet Impala had this problem?

6 months