Long story short I can normally tune but I can?t alter the OS to allow a 1,2,3 Bar RTT enhancement of my choice.
Going through the calibration details it looks to have had a an EFI live custom OS, I have no stock file to revert to, any suggestions?
Vehicle is a Holden 2005 VZ Holden Adventra 5.7 V8 AWD
Current OS 4140003
I?ll upload file as soon as I return home from work. Cheers