ASR, ABS, EDL and yaw control are all different things.
The only way you can disable yaw control is turn off ESP.
EDL - you need to pull a fuse.
As for the ESP function being permanently off - this is very easy to do in the ECU with a single byte mod.
But you won't be able to switch it back on.
PRJ, you said you can disable the ECU's response to ESP with a single byte? Address?
I would like to disable The ecu's response to a loss of traction in a straight line. None of the functions Nyet listed seems to stop ESP from asking the ecu to cut power completely. It allows the car to spin on launch, but then slowly pulls timing as the vehicle accelerates.
I currently run these changes:
KLDMASRL = all 5 values FF
CWMSRSCAN 2= 03 but have tired both 06 and 07
NASNOTKL = all 5 values FF
If I launch hard enough to slip the tires, The ESP light comes on and the longer the power is applied, the more I can feel the car loose acceleration. As if timing is dropping the entire pull. Boost is sustained, throttle is 100%. This condition only stops if you lift completely from the throttle pedal and reapply. Then the car pulls as normal. No power loss.
My case may be different because it is an allroad. I cannot just kill esp with the button anymore because without air suspension, ESP cannot be disabled over 40mph.