Toyota prius Owner's Manual page 536

5-2. Steps to take in an emergency
 In the following cases, the tire cannot be repaired with the emergency
tire puncture repair kit. Contact any authorized Toyota dealer or
repairer, or another duly qualified and equipped professional.
 When the tire is damaged due to driving without sufficient air pressure
 When there are any cracks or damage at any location on the tire, such as
on the side wall, except the tread
 When the tire is visibly separated from the wheel
 When the cut or damage to the tread is 4 mm (0.16 in.) long or more
 When the wheel is damaged
 When two or more tires have been punctured
 When more than 2 sharp objects such as nails or screws have passed
through the tread on a single tire
 When the sealant has expired
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