The ZR engine is a family of straight-four 16-valve all-aluminum and water cooled gasoline engines with a die-cast aluminum block and variable valve timing developed by Toyota Motor Corporation, produced from 2007. Engines displace from 1.6 to 2.0 liters. Most engines in this family are equipped with Toyota's dual VVT-i technology that optimizes both intake and exhaust valve timing. This engine family is also the first to use Toyota's Valvematic system, first appearing on the Noah and Voxy in 2007 and then the European Avensis in 2009.

1ZR-FE

The Toyota 1ZR-FE is a DOHC, 16-valve, 1598 cc engine equipped with dual VVT-i. This engine is available with either manual gearbox (5 or 6 Speed), a "multi-mode" manual transmission (MM-T 5 Speed) or an automatic gearbox (4 Speed). This new engine is now replacing the 3ZZ-FE engine in most applications. Output for this engine is rated at 122 hp at 6400 rpm and 113 lbft of torque at 5200 rpm net.

1ZR-FAE

The Toyota 1ZR-FAE is a DOHC, 16-valve, 1598 cc engine also equipped with Dual VVT-i and Valvematic. Output for this engine is rated at 132 hp at 6400 rpm and 118 lbft of torque at 4400 rpm for most applications. Compression ratio has been increased to 10.7:1, red line is at 6600 rpm. Valvematic varies the intake valve lift between 1 and 11 mm according to load and RPM.

1ZR-FBE

The Toyota 1ZR-FBE is a flex fuel version of the 1ZR-FE the DOHC, 16-valve, 1598 cc engine also equipped with Dual VVT-i and Valvematic. Output for this engine is rated at 125 hp at 6000 rpm and 116 lbft of torque at 5200 rpm.

2ZR-FE

The Toyota 2ZR-FE is a DOHC, 16-valve, 1798 cc engine also equipped with Dual VVT-i. This new engine replaced the 1ZZ-FE engine in most applications. Output for this engine is rated at 132-138 hp at 6000 rpm and 127.5 lbft of torque at 4400 rpm for the Corolla, Matrix, and Vibe and 128 hp and 126 lbft of torque in the Scion xD. Specifications

2ZR-FAE

The Toyota 2ZR-FAE is a DOHC, 16-valve, 1798 cc this engine adopts the Valvematic system. This all-new engine is progressively replacing the 1ZZ-FED and 2ZR-FE engine in most applications. Variants of this engine produce 104 - 110 kW and 171 - 175 Nm of torque. Compression ratio is 10.5:1 and redline is at 6600 rpm. The engine consumes 5–10% less fuel than the 2ZR-FE depending on the application. A special version of the 2ZR-FAE was introduced by Toyota in 2016 for the Taiwanese version of the Toyota Sienta. Unlike the original 2ZR-FAE, this version was created by simply adding the Valvematic system to the standard 2ZR-FE engine used in the Toyota Corolla Altis sold there, resulting in total power of 140 PS at 6200 rpm and a peak torque of 17.5 kgm at 4000 rpm.

2ZR-FBE

The Toyota 2ZR-FBE is A flex fuel version of the 2ZR-FE the DOHC, 16-valve, 1798 cc engine also equipped with Dual VVT-i and Valvematic. Output for this engine is rated at 141 hp at 6000 rpm and 131 lbft of torque at 4000 rpm.

2ZR-FXE

The Toyota 2ZR-FXE is a 1797 cc Atkinson cycle variant of the 2ZR-FE. It has the same bore and stroke, but the compression ratio is increased to 13.0:1, and the inlet valve closing is late-staged. The net result is that the engine has a greater effective expansion than compression. Output is 73 kW at 5200 rpm and 142 Nm of torque at 4000 rpm, paired with electric motor/generators in the hybrid drive system; together the engine and electric motors produce up to 103 kW and 207 Nm. Maximum thermal efficiency is about 38.5%. For the 2016 Toyota Prius, output is 95 hp at 5200 rpm and 105 lbft of torque at 3600 rpm, or when paired with electric motor/generators 71 hp and 120 lbft of torque in the hybrid drive system; together the engine and electric motors produce up to 121 hp. Maximum thermal efficiency is about 40%.

3ZR-FE

The Toyota 3ZR-FE is a 1986 cc DOHC, 16-valve engine with Dual VVT-i.

3ZR-FAE

The 3ZR-FAE is a 1986 cc DOHC, 16-valve engine that was first used in 2007. It is Toyota's first engine with the Valvematic variable lift intake system.

3ZR-FBE

A flex fuel version of the 3ZR-FE was released in March 2010 in Brazil with 142 PS when running on petrol, and 153 PS on ethanol.

4ZR-FE

The Toyota 4ZR-FE is a 1598 cc DOHC, 16-valve engine with Dual VVT-i. Output for this engine is rated at 117 hp at 6000 rpm and 150 Nm of torque at 4400 rpm. It is very similar to 1ZR-FE.

5ZR-FXE

Specification is similar to 2ZR-FXE & a region-coded model due to various reasons.

8ZR-FXE

Production

The 1.6 L and 1.8 L ZR engines are built in Tianjin FAW Toyota Engine Co., Ltd. (TFTE) Plant No. 2, beginning in April 2007 and in the West Virginia Plant for Corolla's production in the United States and Canada. The 1.8L Hybrid FXE engines are built in Toyota's Deeside engine manufacturing plant in the UK and shipped to their Burnaston, UK plant to be fitted into the Corolla Hatch and Touring Sport versions. The plant also supplies these engine parts to Toyota's assembly lines in France, Turey, South Africa and Japan.