Quote:
Originally Posted by dwarfnebula
CFECO, flex fuel cars have an ethanol content sensor in the fuel line, that's how they tell.
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some/most do. some/most others do not.
from what i've seen, the sensors used to analyze ethanol content in fuel are VERY expensive, to the point of where a lot of manufacturers are doing without them and guessing fuel composition based on O2 sensor and some other inputs. when the O2 signals return expected results, then an ethanol content value is generated and other items controlled by the PCM are adjusted as such.