Where is the factory flex fuel ethanol content sensor located on a NNBS? (rcsb or?)
Any pics?
Also part number if possible
Mine is an 07
Thanks again
Dom

 

There is no "actual" ethanol sensor on these trucks. Its a virtual sensor. Many people like myself have installed and wired in the actual GM ethanol sensor. Its fairly easy to do. Cant remember the part # for the sensor though.

 

Yeah it takes readings from the o2 sensors to determine alcohol content.

Like said you'll have to wire in a real sensor to have a really accurate reading for the computer.

 

...that explains why i couldn't figure it out with the dealer...has there been a write-up on this?
Also,is the software there in a non-flex fuel NNBS?