My 2007 has started to display the red triangle when taking hard turns. Any ideas why only in turns? Posted via the PriusChat mobile app.
Have an auto parts store read the error codes... Or get a phone app like Hybrid Asst or Dr. Prius via a Bluetooth OBD2 reader: Hybrid battery diagnostic and repair tool for Toyota and Lexus or a Toyota Techstream Software like: Mini VCI J2534 OBD2 Diagnostic Tool Code Reader for Lexus Toyota Techstream New | eBay
As Bisco mentioned, this is very likely a low oil issue. Check your oil level immediately, and top off with high quality 5w-30 if it's low (it probably is).