The ME221/ME442 supports flex fuel as standard. You will need to wire the flex sensor (use the standard GM type) into a spare HIGH SPEED Digital Input (GEN1 Black Plug Ins, ME221 Wire In) or a normal Digital Input (GEN2/White Plug-Ins/ME442 Wire-In).


Check it shows the fuel flex amount and temperature correctly in MEITE once you have installed it before attempting to tune it.


  1. Map as normal using the traditional fuel tables on normal gasoline. Use Flex fuel ethanol % reading (from the DRO) to set ‘Base Tables Eth’ in the Flex Fuel Settings
  2. Fill the tank with “high ethanol” fuel - maximum ethanol % that the car will ever see.
  3. Set that value in ‘Aux Tables Eth’ - Flex Fuel Settings
  4. Enable ‘Flex Fuel’ from within the Flex Fuel Settings
  5. Map the engine as normal, but use the "Flex" related tables . They are all in the relevant sections (or use the search box at the top of the tree view and type in "flex".