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5.3 flex fuel, reading wrong fuel, where is sensor? part #


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My son't 2012 flex fuel GMC it having issue's with reading  the correct fuel. He has only run e85 once in 120k. It now runs like shit again and I'm sure its this sensor. Truck shop is closed for Christmas. They had checked and cleaned it? the last time it was in.  Does anyone have a photo and part #

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They obviously didn't do it properly or you would be reading around 10% or whatever the value is in the gas in your area.  Try again or go to GM this time as they have enough TSBs on it.  You aren't replacing parts to fix it as there is no sensor to change.  That is provided your oxygen sensors are working properly.  

Edited by SierraHD17
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On 12/25/2018 at 9:02 AM, Tazzerblue said:

My son't 2012 flex fuel GMC it having issue's with reading  the correct fuel. He has only run e85 once in 120k. It now runs like shit again and I'm sure its this sensor. Truck shop is closed for Christmas. They had checked and cleaned it? the last time it was in.  Does anyone have a photo and part #

2012s do not have alcohol sensor.  Fuel Trims and Alcohol Content have to reset in that order after tank is run down and non ethanol gasoline put in, 5 gallons or so.

 

But first, what happened?  Exactly what is it doing? 

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