The 2004 Toyota Prius features a 1.5-liter 4-cylinder Atkinson cycle gasoline engine (1NZ-FXE) paired with an electric motor in Toyota’s Hybrid Synergy Drive system. The gasoline engine produces 76 horsepower at 5,000 rpm and 82 lb-ft of torque at 4,200 rpm. Combined with the 67-horsepower electric motor, the system delivers a total of 110 horsepower. The Atkinson cycle design sacrifices some power for improved fuel efficiency by using a longer expansion stroke than compression stroke. This engine runs on regular unleaded gasoline and features aluminum construction with dual overhead cams and variable valve timing.

The 2004 Toyota Prius shares most parts with the 2001-2003 model years of the first-generation Prius sold in North America. The hybrid battery pack, inverter, electric motor, gasoline engine, transmission, and most body panels interchange directly between these years. However, there were minor updates throughout the generation, so some electrical components and trim pieces may have slight variations. The 2004 model received updated headlights and some interior changes that differ from earlier years. Parts from the second-generation Prius (2004-2009 in other markets, 2004-2009 globally) may fit but require verification due to significant redesign differences in the hybrid system and body structure.

Parts availability changes daily. Call us at (603) 392-7313 or visit our online shop to check current inventory from this specific vehicle. If we have sold a part you need, our Parts Broker service can source it from our network of partner yards nationwide.

Yes! We ship parts from this vehicle and our entire inventory nationwide. Most orders ship within 1-2 business days via FedEx or freight carriers for larger components like engines and transmissions. Call (603) 392-7313 for a shipping quote on any part.

The 1.5L 1NZ-FXE engine in the 2004 Prius is generally reliable and can easily exceed 200,000 miles with proper maintenance. The Atkinson cycle design reduces stress on internal components, and the hybrid system allows the engine to shut off frequently, reducing wear. Common maintenance includes regular oil changes every 5,000 miles using 0W-20 synthetic oil, coolant system service every 100,000 miles, and spark plug replacement every 120,000 miles. The engine rarely experiences major internal failures, but the hybrid cooling system and related components require attention. The biggest reliability concern is the hybrid battery pack rather than the gasoline engine itself.