2012 Prius in very good condition with 180k miles- only 12 years old. Driving on back roads (thankfully) and the drivers side rear wheel compelely fell off while driving. I was doing about 30 MPH and felt like there was a flat tire so I was in the process of pulling over when the whole rear assembly snapped. The wheel hit the rear quarter of the car and bounced about 100 feet down the road. I could have been on the highway and this could have been fatal I believe. Very, Very scary. As can be seen in attached photos the issue was rust from the inside. This is very concerning since there was no way for me to know this was an issue. I could have been killed or killed someone else. I believe Toyota needs to look into this since there are other Prius' out there the same thing happened to on this very thread. Although this is a Massachusetts car I have owed it since 25k miles and have maintained it impeccably. I always have the undercarriage cleaned after driving on salty roads. Safety inspection was current- only done the month before. Had that wheel bearing replaced about 2 weeks before the incident and the reputable mechanic reported no issues. There was no warning except for maybe a minute before it happened- the car was vibrating like I had a flat tire. The damage repair estimate on this was $8500. Catastrophic fail Toyota. Is this a rust issue like the Tacoma, Tundra, and Sequoia"???"

- Plainville, MA, USA

More than once I was driving about 40/45mph, once on a curve, anyhow as I was going through the curve it felt as though the brakes engaged, without me touching them. I understand the safety thing, however at both instances it was not necessary. It caused the car to pull to the left. Almost causing me to loose control.

- San Diego, CA, USA

Turning right from a stop sign stop, the car took off in an unintended acceleration and could not be stopped until it hit a curb. The force broke the ball joint of the driver's side wheel causing the wheel to turn approx 45 degrees. The car then skidded about 20 yards and came to a stop with the motor racing. It was a single car crash with no bodily injury.

- Port Orange, FL, USA

Vehicle is parked outside, and during morning cold start, the vehicle produces a moaning/wooing sound for approx. 50-75 yards with vehicle moving under 25 mph. The sound is being generated from the front wheel wells. Sound generated is related to vehicle speed. The faster the vehicle moves, the more frequent the sound being produced during the first 50-75 yards. Strange sound is gone after that, and does not return until the next cool/cold start. Owner took the vehicle back to dealership for inspection, and dealer took off the front wheel to inspect brakes, wheels, and tires, and was not able to locate or reproduce the problem. Abnormal sound is only produced during morning cold starts and when vehicle is left to cool(I.e. parking lot at work).

- San Diego, CA, USA