There are 1 owner-reported engine complaints for the 2017 Toyota Prius Primein NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Toyota has a very well known issue with head gasket failures right around 140k miles that they refuse to address. This is my second Prius and my second failure right at 140k miles. They refuse to acknowledge it, but the advisors in the service department say that's their "bread and butter." They repair bad head gaskets on priuses for $5k all day long. Toyota needs to do right by their clients.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026