The ethanol sensor continuously measures the ethanol content of the fuel. The ethanol content (if the fuel is changed) should increase or decrease after refueling depending on whether the ethanol sensor is installed in the return or in the pressure fuel line. The ethanol content should not change during driving if the vehicle is not refueled.
If ethanol sensor is not connected or control unit does not recognize ethanol sensor, eFlexFuel uses the ethanol content percent which was last read.
If ethanol sensor detects dirty fuel, eFlexFuel uses 40 % ethanol content percent.
Do not use vehicle if eFlexFuel App shows wrong ethanol content!