The Toyota NZ engine family is a straight-4 piston engine series.

The 1NZ series uses aluminum engine blocks and DOHC cylinder heads. It also uses SFI fuel injection, and has 4 valves per cylinder with VVT-i.

 1NZ-FXE

The 1NZ-FXE is the earliest 1.5 L (1497 cc) version built in Japan. Bore is 75 mm and stroke is 84.7 mm. It features forged steel connecting rods and an aluminum intake manifold. The engine has a high physical compression ratio of 13.0:1, but the closing of the inlet valve is delayed. The net result is that the engine has a greater effective expansion than compression—making it a simulated Atkinson cycle, rather than the conventional Otto cycle.

The reduction in cylinder charge means reduced torque and power output, but efficiency is increased. This combination makes the 1NZ-FXE suitable for use with the Hybrid Synergy Drive, where peak torque and power are of less importance. Output is 57 kW (76 hp) at 5000 rpm with 115 Nm (85 lb·ft) of torque at 4000 rpm. Production was stopped in 2009, at arrival of Prius III.

In 2012, at arrival of Prius C (North America), Prius Aqua (Japan), Yaris Hybrid (Europa), a new version occurs. Without any belt-driven accessories, a physical compression ratio of 13.4:1, the new version delivers an output of 54 kW (74 hp) at 4800 rpm with 111 Nm (82 lb·ft) of torque at 3600–4400 rpm.

The 1NZ-FXE Hybrid Synergy Drive in the Toyota Prius has won several International Engine of the Year awards:

• Best Eco-friendly 2000
• Best Eco-friendly 2001
• Best Fuel Economy 2005
• Best 1.4-litre to 1.8-litre 2005
• Best Fuel Economy 2006
• Best 1.4-litre to 1.8-litre 2006

Applications:

• Toyota Prius
• Toyota Prius C
• Toyota Yaris
• Toyota Corolla (Axio/Fielder)

1NZ-FE

The 1NZ-FE is a 1.5 L (1497 cc) conventional Otto-cycle variant of the 1NZ-FXE with VVT-i. It retains the same bore and stroke, but the compression ratio is lowered to 10.5:1. Output is 80 kW (107 hp) at 6000 rpm with 141 Nm (103 lb·ft) of torque at 4200 rpm. The redline is 6400 rpm.

Applications:

• Toyota Yaris/Echo
• Scion xA/ist
• Scion xB (1st generation)/Toyota bB (1st generation)
• Toyota Vios
• Toyota Belta
• Toyota Raum
• Toyota Porte
• Toyota Platz
• Toyota Ist
• Toyota Auris
• Toyota Fun Cargo
• Toyota Premio
• Toyota Allion
• Toyota Sienta
• WiLL VS
• Toyota Probox
• Toyota Ractis
• Toyota Corolla (Axio/Fielder, RunX, Allex)
• Geely CK (Produced under license)
• Geely MK (Produced under license)
• Great Wall C10

2NZ-FE

The 2NZ-FE is a 1.3  L (1298 cc) version built in Japan. Bore is 75 mm and stroke is 73.5 mm, with a compression ratio of 10.5:1. Output is 63 kW (84 hp) at 6000 rpm with 121 Nm (89 lb·ft) of torque at 4400 rpm.

The Toyota 2NZ-FE 1.3 L engine was designed in 1999 with Otowa Yamaha as the head engineer of the project. Toyota introduced the VVT-i system on the 2NZ-FE to improve fuel efficiency and emissions. VVT-i is now a standard feature on all current Toyota engines, except on the Toyota/Daihatsu 1KR-DE found in the Toyota Agya/Daihatsu Ayla.

Applications:

• Toyota Yaris/Echo/Vitz
• Toyota Vios
• Toyota Platz
• Toyota Belta
• Toyota Porte
• Toyota Corolla (E140), Pakistan only
• Toyota Corolla (E170), Pakistan only
• Toyota bB
• Toyota Ist