Acura 2008 TSX base, won't start, cranks but won't turn over, any ideas?

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The car has sat a lot outside for over a year. It hasn't started for 6-7 weeks, 2 weeks ago it started, I filled it up, next day it wouldn't start and hasn't since. The car cranks, but won't start. Battery replaced 5 weeks ago. Lights on are check emissions, check TPMS. Took it to a mechanic, he said the main computer won't communicate with the diagnostic machine. My friend thinks its old gas and I should put dry gas in, the mechanic thinks it could be anything up to the main computer. The original main computer was replaced around 60k, so this is the second. Any thoughts would be very helpful.