The steering wheel of my 2000 prism vibrates at 55 mph. What’s going on? What needs to be repaired? I had 1990 prism that had more than 200,000 miles on it. This one only has 198,000 miles.
It could be suspension parts, a out of balance wheel or a defective tyre.
You can bring it to a shop you trust for alignment issues and they should be able to find and fix what it may be.
If you want to try and figure it out yourself, you can have someone drive slowly away from you while you look at the tread. If one tyre shows the tread moving side to side, you likely have a belt slipping in the tyre and you need one or more new tyres. You also should compare the tread. Is it worn? Is it worn evenly? any chunks of rubber missing? Does it appear a wheel weight may have come off?
You can have the tyres rotated. If there is anything wrong with the tyres or wheels, it should feel different as the problem wheel will not be on a different corner of the car.