Toyota Prius XW20
Weaknesses, engine ratings and buying advice
The second-generation Prius (2004–2009) proved hybrids work. One million sold by 2008. Budget city car — if you know what to check.
HV battery: Every Gen 2 is past its design life. Remanufactured pack: $950–$2,600. Code P0A80 = replacement needed.
Inverter coolant pump: Gen 2’s most notorious failure. Code P0A93. OEM only — $300–$600.
Dashboard cluster: Capacitors fail on combination meter — speedometer goes dark. Common on 2004–2006 (~$200 refurb).
Cat converter theft: Gen 2 is the #1 stolen hybrid cat in North America.
Best buy: 2008–2009. 2026 price: $3,000–$8,000.
Generations
Engine Overview
The Toyota Prius XW20 is available with one engine variant at 72 hp.
Hybrid drivetrain on the Atkinson cycle, deliberately tuned for efficiency over torque. The combustion side runs in its sweet spot while the electric motor handles the rest, so fuel use stays low and mechanical stress is modest. Timing chain, maintenance-free. The main concern is the state of the high-voltage battery: typically good past 200,000 km, but check cell balance and run a diagnostic before buying. Keep an eye on the inverter cooling system; oil changes every 15,000 km are enough.
- !! Inverter-Kühlwasserpumpe defekt (P0A93) from 90,000 km
Die elektrische Inverter-Kühlwasserpumpe versagt bei 2004–2009 Prius durch internen Kurzschluss. Ohne Austausch: Inverter-Überhitzung und Totalschaden.
Symptoms: Dreieck-Warnung im Display, reduzierte Leistung, Motor schaltet ab - !! HV-Batterie-Degradation (NiMH) from 150,000 km
Die NiMH-Traktionsbatterie verliert ab ca. 150.000 km spürbar Kapazität. Kraftstoffverbrauch steigt, EV-Anteil sinkt.
Symptoms: Weniger EV-Fahranteil, steigender Verbrauch, Batterie-Warnung - !! Oil consumption from piston ring wear from 200,000 km
From around 200,000 km the Atkinson-cycle engine in the Prius XW20 tends towards elevated oil consumption due to worn piston rings. Extended periods standing still and short trips accelerate wear.
Symptoms: Oil consumption above 0.5 l/1,000 km; faint blue smoke from the exhaust under power demand
+ 6 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Brake Disc Rust from Regenerative Braking Since the Prius XW20 relies primarily on regenerative braking, the brake discs are rarely used mechanically and rust quickly. Symptoms: Scraping and squealing when braking, extended stopping distance, vibration through the pedal. from 80,000 km | Low |
Top Reported Issues
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Known Problems and Issues +
A total of 19 weaknesses have been documented for the Toyota Prius XW20 (2003–2009) — 9 engine-related and 10 vehicle-related. Typical issues affect Brakes, Electronics, Suspension, Cooling.
Prius (1NZ-FXE, 2003–2009) — Be Careful: Inverter-Kühlwasserpumpe defekt (P0A93), HV-Batterie-Degradation (NiMH), Oil consumption from piston ring wear. Power: 72–77 PS.
What to watch out for with the Toyota Prius? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Toyota Prius XW20 have? +
What should I look for when buying a used Toyota Prius XW20? +
Which engine is recommended? +
Which Toyota Prius XW20 engine is the most fun? +
Is the Toyota Prius XW20 worth buying used? +
What horsepower variants are available for the Toyota Prius XW20? +
Last updated: February 2026 · All information without guarantee