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When my stepmother's oldest son inquired me about a rumor that any car with EFI would in fact be flexfuel, one of the aspects I pointed out to him was ethanol being used to bump the octane rating up of the lower-grade gasoline available in Brazil. However, as ethanol is classified as an "oxygenate", a larger amount of ethanol would lead the OČ sensor to throw an error code even if the engine would be still running smooth.
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