Steering/ABS light

ABS and engine management light come on. Had a diagnostic test done which come up with ABS ring issue. So far I've had the outer CV joint with ABS ring changed but the warning light still on is this meant be turned of or does it turn itself of. The main issue is the EPS light come on but not been picked up on diagnostics tool then the light turns of and drives fine. The steering feels like it shaking when turning at low speed and when turn engine of then back on issue seems to be gone.