The 2004 Toyota Prius is equipped with the 1NZ-FXE 1.5-liter inline 4-cylinder Atkinson cycle gasoline engine paired with Toyota’s Hybrid Synergy Drive system. This engine produces 76 horsepower and 82 lb-ft of torque, working in conjunction with a 67-horsepower electric motor for a combined system output of 134 horsepower. The Atkinson cycle design prioritizes fuel efficiency over power, contributing to the Prius’s exceptional EPA ratings of 60 mpg city and 51 mpg highway. The engine features aluminum construction, variable valve timing, and is designed to run on regular unleaded gasoline.

The 2004 Toyota Prius shares most parts with the 2001-2003 model years, as they represent the first generation (NHW11) of the Prius. Major components like the hybrid battery, inverter, engine, transmission, body panels, interior trim, and suspension components are largely interchangeable across these four model years. However, there were minor running changes, particularly in the electrical system and some trim pieces. The 2004 model received updated software and slight refinements but maintained the same basic architecture. Parts are NOT compatible with the redesigned 2004.5+ second-generation Prius, which began production in late 2003 as a 2004 model year with completely different styling and components.

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 1NZ-FXE 1.5L engine in the first-generation Prius is generally reliable but has some known weaknesses. The engine itself is robust and can easily exceed 200,000 miles with proper maintenance, particularly regular oil changes every 5,000 miles. However, oil consumption issues can develop after 100,000 miles due to worn piston rings. The Atkinson cycle design reduces stress on internal components, contributing to longevity. Regular maintenance is crucial, including timely replacement of the engine air filter and PCV valve. The hybrid system reduces engine runtime, which actually extends engine life compared to conventional vehicles. Overall, expect good reliability with attentive maintenance, but budget for potential oil consumption issues in higher-mileage examples.