Bentframe, one for each wheel correct?

 

correct...but most likely it's just one, they won't go out at the same time...

 

Anyway to know which ABS sensor?

 

have a friend drive your car and listen from outside.....just have him stop right next to you, and do it on both sides, that will give you a better idea than just doing it from one side...

 

if you suspect the Abs sensor, have a look at all of them
try pick up any dirt around the sensor or a bad wire, and check the condition
of the Tone Ring on the shaft, to see if there is any broken or
chiped ones, I f everything seems ok its time to get out
you A.C. meter, Disconnect the sensor and probe the wires with your
leads and spin the tire, do this to all the wheels @ almost the same speed
all the sensors should be roughly the same depending on the speed
Im not sure if you can do it with the VAg Com ??
By the way while you having a look make sure the rotor is sitting flush on the Hub
and there is not rust build up around the rotor ...