This is the elephant in the room. If it hasn't been replaced, it’s likely nearing the end of its life (usually 12–15 years or 150k miles). Ask for a battery health test or use a Bluetooth OBDII scanner with the "Dr. Prius" app to check the blade voltages yourself.
At 100k miles, a Prius needs more than just oil changes. Verify if the following have been done: buying a used prius with over 100 000 miles
Buying a high-mileage Prius (100k–200k+ miles) is often a smart move because the powertrain is famously over-engineered. However, at this age, your risks shift from "engine failure" to "maintenance neglect." 1. The "Big Three" Inspection Points This is the elephant in the room
Generation 3 models (2010–2015) are known for burning oil once they cross 100k miles. Check the dipstick; if it’s bone dry, the previous owner may have caused engine damage. 2. Service History Milestones Prius" app to check the blade voltages yourself
Very reliable and much better fuel economy (50+ MPG). If you find one with 100k miles, it was likely a rideshare vehicle—check the interior wear. 4. Red Flags to Walk Away From
On 2010–2015 models, the Exhaust Gas Recirculation (EGR) valve and cooler clog with soot, which can eventually lead to a blown head gasket.