I will check to see if this is the one causing some of my problems. One CL member here said that changing the sensor fixed the "slingshot" effect on the car. My car is doing it now and my favorite dealer was unable to resolve it. I'll give it a try myself. I talked to Gordon at Carson and he does not have a page of the GS4 factory manual showing how to replace it.

Hope someone here knows where this sensor is located and how to access and test it. Thanks.