I had this same problem. The car would shift in such a way that the steering wheel would shift 10 degrees while turning. Then when I would hit a bump, turn back in the opposite direction or come to a stop it would shift back. I first replaced the steering rack and pinion purchased new rack bushings from Nissan. The problem was still there. I tightened the bushing brackets as tight as I could with breaking or stripping something and the problem easstill there. Then I noticed the bearing in the front strut mount on the passenger side was broken when I removed the cap and saw the strut retaining screw was off center. So I replaced the strut mount and struts on both sides. The problem was still there. Then I inspected the steering rack coupler tightened it and marked it so I could see if it was moving. It was not moving and the problem was still there. I then raised the car and grabbed the wheels at the 3 and 9 o'clock positions and moved pushed and pulled and there was movement. I saw on a video somewhere this was a possible cause and an indicator of bad ball joints on the lower control arm. I replaced the control arms on both sides and the problem is gone. I hope this helps someone. It took me months and a lot of unnecessary repairs to find the cause.
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