Power steering vibration that comes and goes while driving.

Hello, this steering system is not a hydraulic system - power assist is provided by an electric motor. As a result, checking fluids won't be of any relevance to this steering system. Because it is electronic, it's possible there's a concern with the system that is causing the symptom you are experiencing. The key to resolution will be to have a technician familiar with this vehicle and system duplicate what you're experiencing, so the concern can be figured out with hands on troubleshooting. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops