Help with ABS light on please

Hi
Sorry a girlie needs some advice here please?
My ABS light is on,diagnostics shows NSR sensor problem. It looks like this car failed has had this problem before as the wiring on that side looked rather tampered with. I have had someone replace the dodgy looking wiring, take all the wheels off clean up all the sensors etc but light still on.
They have said it could be either wheel baring as apparently the sensor connects to that in someway, or the sensor or the pump thingy?
I do not just wanna keep on chucking money at the car can anyone suggest a way to go about eliminating things
Help!!!
Should I run it to Nissan and get them to put a machine on it to pin point the exact fault but I am worried it will be so expensive
Any ideas Guys or Gals ?
Much appreciated
Maxine
 
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