One problem related to accelerator pedal sensor has been reported for the 2006 Toyota Prius. The most recently reported issues are listed below.
2006 Prius was arriving at work and pulling into a parking space. My foot was removed from gas, but accelerator stuck open. The car bounced over the concrete curb, over a snow bank and over a second curb into the university driveway. Car sustained $3800+ in body damage and another $370 in service repairs for brakes, tires, suspension and dash warning systems that erupted. Vehicle was recently repaired. Local dealer would not accept any responsibility or acknowledge any problems with the car. Final repair invoice states the vehicle floor-mats, abs and pedal stroke sensors were all working properly. Claim was made to our insurance company [erie insurance].