2009 H2…So I checked for vacuum leaks briefly.. (any common ones I might have missed?) Checked but no code thrown for a bad alcohol content sensor.
I’ll check the MAF sensor (no codes) next but really wanted to know if it’s just coincidence that alcohol now reads 0% when it was about 74% yesterday…
and suddenly I’m showing full system as lean. If it thinks there is no alcohol it would flow less fuel, right?
ST fuel trim is reading a bit high as expected.

 

0% alcohol?

 

try resetting the sensor with a scan tool

 

Do you know if the 2009 H2 has an actual fuel composition sensor or is it virtual?

I've been trying to locate it and am having no luck online.

 

i don't know my 03 does not run e85 but typically on gm vehicles when that parameter is out of whack it needs a reset.