Hi My prius c ,s steering wheel is sometimes smooth but sometimes its hard. I tested on the same road with only me inside the vehicle. Is there something wrong with the rack ?. Should I check my car ?. My tire size is 195/65/r16 Thanks you
if it is still under warranty go to dealer and have it checked. Sounds like there some issue with rack or at least with loose or corroded contact, so it doesn't get power. In humid climate many electric issues can be traced to contact corrosion.