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Originally Posted by ByThaBay

No. To use the flex fuel sensor you would have to disable some evap codes and so the EVAP monitor would also be disabled. The EVAP monitor is required to be in either INCOMPLETE or COMPLETE state. N/A state indicates disabled codes and the vehicle will fail smog.

Aside from using a flex fuel sensor, there are other learning approaches that could be implemented using the ecutek custom programming language to determine ethanol content directly from combustion results, thus not requiring the need for a flex fuel sensor. There are multiple ways to handle flex fuel, each approach has its advantages/disadvantages.

Originally Posted by redondoaveb

Yeah, that's my issue right now. My evap monitor shows incomplete. My car is a 2017 and my ecu doesn't have the same (RAM) capabilities as the older years. I wonder if flex fuel programming could be done through my ecu.

Originally Posted by ByThaBay

It's actually not so much the ecu, it's the firmware that takes up more space leaving less room for the custom programming framework. I recently did one and I used every single table/variable that was available to implement my custom airflow modeling and fail-safes. Have you tried running an older version of the firmware? In theory, it should work fine if you could find a firmware that wouldn't trigger DTCs.