AEM 02 sensor reading volts instead of AFR in TunerStudio
The fact that TunerStudio insists on displaying volts instead of AFR when using the AEM UEGO O2 sensor was really annoying me, especially as I was having no luck getting the thing tuned after replacing the head gasket. After a lot of internet searching I found the solution, and it now reads in lovely AFR... and oh dear, it showed the previous AFR target values were dangerously lean. It's now FIXED, and I'm tuning it in on the drive to work. This is how: Find the mainController.ini file (there are likely to be many, the one you need will be in \Documents & Settings\ your name \My Documents\TunerStudioProjects\ project name Open it with Notepad , and replace the line: #elif AEM_LINEAR afrBins1 = array, U08, 0, [8x8], "Volts", 0.0196, 0, 0.0, 5.0, 2 with: #elif AEM_LINEAR afrBins1 = array, U08, 0, [8x8], "AFR", 0.038666, 255.0, 10.0, 20.0, 1 TunerStudio will now show AFR. Assuming yo