The Toyota AZ engine family is a

straight-4 A straight-four engine (also called an inline-four) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The vast majority of automotive four-cylinder engines use a straight-four layout (with the ...

piston engine A reciprocating engine, also often known as a piston engine, is typically a heat engine that uses one or more reciprocating pistons to convert high temperature and high pressure into a rotating motion. This article describes the common featu ...

series. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium DOHC cylinder head. The engine series features many advanced technologies including slant- squish combustion chambers, offset cylinder and crank centers, and the VVT-i continuously variable intake valve timing system. The aluminium engine measures long, wide, and tall. The cylinder block is an open-deck, midi-skirt die-cast aluminium type with cast-in iron liners and a die-cast aluminium lower

crankcase In a piston engine, the crankcase is the housing that surrounds the crankshaft. In most modern engines, the crankcase is integrated into the engine block. Two-stroke engines typically use a crankcase-compression design, resulting in the fuel/a ...

and a stamped oil pan. The forged steel

crankshaft A crankshaft is a mechanical component used in a piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating shaft containing one or more crankpins, that are driven by the pistons via the connecting ...

is fully balanced with eight counterweights and supported by five main bearings. A helical gear pressed in No. 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase. The dual overhead camshafts are driven by a single-stage roller chain of pitch, enabling a narrow included valve angle of 27.5°. The camshafts act on four valves per cylinder via bucket tappets. As in the recent Toyota engine practice, no clearance adjusting shim is employed. Valve diameters are for intake and for exhaust, with lift for both intake and exhaust. The four-vane VVT-i device is fitted on the intake camshaft, altering timing by 50°. The valve cover is made of magnesium to save weight. Fuel is injected sequentially via an ultra-fine-atomization injector with twelve small injection holes, each in diameter. As in the smaller NZ engine, the new AZ adopts a plastic, built-up, and vibration-welded intake manifold integrating a large volume

plenum chamber A plenum chamber is a pressurised housing containing a fluid (typically air) at positive pressure. One of its functions is to equalise pressure for more even distribution, compensating for irregular supply or demand. It is typically relatively la ...

( volume including a resonator).

Exhaust manifold In automotive engineering, an exhaust manifold collects the exhaust gases from multiple cylinders into one pipe. The word ''manifold'' comes from the Old English word ''manigfeald'' (from the Anglo-Saxon ''manig'' anyand ''feald'' old and refe ...

s are of tubular construction with integrated catalytic converters. The AZ is the replacement for the S engine. Its successor is the AR engine.

Excessive oil consumption

The 2AZ-FE engine in the 2007-2009 Camry and 2006-2009 Rav4 may burn excessive oil and is involved in this lawsuit. Other engines are also affected. If this Toyota engine is burning more than of oil in , has less than , is less than 10 years old, and is located in the U.S., Toyota service will perform a free oil consumption test to determine if the engine is affected. There are approximately 1,715,200 vehicles covered by this Warranty Enhancement Program.

1AZ

The ''1AZ'' line of engines have displacements.

1AZ-FE

The 1AZ-FE is a version. Output is at 6000 rpm with of torque at 4000 rpm for the Camry Aurion version. Rav4 and Ipsum engines were rated at at 6000 rpm and of torque at 4000 rpm. The 1AZ has a total displacement of with bore and stroke, and a compression ratio of 9.6:1. * 2002-2006 Toyota Camry ( Asia version) * 2006–2009 Toyota Camry ( Aurion version) * 2000–2003 Toyota RAV4 * 2003-2006 Toyota RAV4 Euro * 2001–2009 Toyota Ipsum * 2004–2008 Toyota Wish (Thailand)

1AZ-FSE

The 1AZ-FSE is a version. Bore and stroke is , and a compression ratio of 11.0:1. Output is at 5700 rpm with of torque at 4000 rpm. The 1AZ-FSE features Toyota's D-4 direct injection system. * Toyota Avensis *

Toyota Avensis Verso The Toyota Ipsum, Picnic, SportsVan or Avensis Verso is a car produced by the Japanese carmaker Toyota from 1995 to 2010. It is a compact MPV with standard three-row seating. The Ipsum, like many Toyota products, was shared as a trio of the Toyo ...

* Toyota Noah/Voxy * Toyota RAV4 *

Toyota Gaia The Toyota Gaia is a Japanese market MPV that competed with the Nissan Prairie, Mitsubishi Chariot and the Honda Odyssey. It was replaced by the Toyota Isis. The Gaia shares a platform with the Toyota Ipsum (sister car) and Toyota Caldina (pla ...

Toyota Isis The Toyota Isis is a seven-seat large MPV manufactured by Kanto Auto Works under contract for Japanese automaker Toyota. It is sold in Japan and was launched in September 2004. It features sliding doors and is available with either front- or f ...

* Toyota Ipsum * Toyota Caldina * Toyota Wish *

Toyota Nadia The Toyota Nadia is a compact MPV produced by the Japanese automaker Toyota from 1998 to 2003. It was sold only at Japanese dealerships called ''Toyota Corolla Store'' next to the Corolla and popular in the Russian Far East (Yakutsk, Vladivostok ...

* Toyota Allion *

Toyota Premio The and its twin the are sedans sold in Japan from 2001 to 2021 by Toyota. The sedans are designated as a compact car by Japanese dimension regulations and the exterior dimensions do not change with periodic updates. Unlike Toyota's other v ...

Toyota Opa The is a compact car produced by Toyota. Its name derives from the exclamation for surprise in Portuguese. It was introduced at the October 1999 Tokyo Motor Show as a prototype car, and was put into production in January 2000. It was the resu ...

2AZ

The ''2AZ'' line of engines have displacements.

2AZ-FE

The 2AZ-FE is a version built in Japan (Kamigo Plant and by Toyota Industries Corporation), at TMMK in the USA and also built in China for select Scion xB models, and also in Australia, obtains a total displacement of with bore and stroke, with a compression ratio of 9.6:1. Output is at 5600 rpm; of torque at 4000 rpm. Later versions of the 2AZ-FE engine were upgraded with 9.8:1 compression ratio, a slightly more aggressive intake cam profile, 6500 rpm redline, and piston oil squirters. These later versions are rated at in the Scion tC, in the RAV4, and in the Camry, Corolla XRS, Scion xB, and for the Previa/Estima/ Alphard. Japan-made Toyota vehicles with the 2AZ-FE engine were equipped with the K112 transmission also referred to as 7-speed Super CVT-i automatic (Seven-speed Sequential Shiftmatic) from October 2005. However, these later 2AZ-FE models were the first to be rated under the new

SAE SAE or Sae may refer to: Science and technology : * Selective area epitaxy, local growth of epitaxial layer through a patterned dielectric mask deposited on a semiconductor substrate * Serious adverse event, in a clinical trial * Simultaneous Auth ...

J1349 standard. The new standard usually produces more conservative numbers, though no definitive comparison is available since the two versions were never tested by the same standard. The RAV4 uses a different timing chain cover from the Camry, they can however be interchanged. A TRD supercharger was available for the Scion tC until Spring 2009. There have been complaints of this engine "burning oil" in North America, with the issue starting after , though mostly after . Piston ring design has been identified as a potential problem. Toyota has issued a TSB (Technical service bulletin) TSB #0094-11 in August 2011 but has not issued a recall. Alternative theories point to a head gasket problem: the 2AZ-FE aluminum block threads may wear out on the back three middle bolts (closest to firewall). Check TSB SB-0015-11. There are several class-action lawsuits underway regarding this issue. In January 2015, Toyota North America issued extended warranty notification (ZE7) for this issue for Toyota North America vehicles only. * 2002–2009 Toyota Camry * 2009–2011 Toyota Matrix S (USA)/XR (Canada)/XRS * 2009–2010 Pontiac Vibe * 2009–2010

Toyota Corolla The is a series of compact cars (formerly subcompact) manufactured and marketed globally by the Toyota Motor Corporation. Introduced in 1966, the Corolla was the best-selling car worldwide by 1974 and has been one of the best-selling cars in ...

XRS (2011-2013 only in Mexico and in Canada) * 2002–2008 Toyota Camry Solara * 2004–2012 Toyota RAV4 * 2000–2007 Toyota Highlander/Kluger * 2000−2013

Toyota Harrier The is a five-passenger compact, later mid-size crossover SUV produced by Toyota since December 1997 in Japan, which was once exclusive to ''Toyopet Store'' Japanese dealerships. In export markets, the Harrier was rebadged as the Lexus RX from ...

* 2000-2019

Toyota Estima The Toyota Previa, also known as the in Japan, and Toyota Tarago in Australia, is a minivan that was produced by Toyota from 1990 until October 2019 across three generations. The name "Previa" is derived from the Spanish and Italian for "previ ...

/ Toyota Previa /

Toyota Tarago The Toyota Tarago is the marketing name for several Toyota people mover vans sold in the Australian market from 1983 to 2019. * From February 1983 to 1990, the Tarago was a rebadged version of the Toyota TownAce/MasterAce Surf sold in Japan. ...

* 2001-2010 Toyota Ipsum * 2002−2015 Toyota Alphard * 2008−2015

Toyota Vellfire The is a minivan produced by the Japanese automaker Toyota since 2002. It is available as a seven or eight-seater with petrol and hybrid engine options. Hybrid variants have been available since 2003, which incorporates Toyota's Hybrid Synergy ...

* 2006−2012

Toyota Blade The is a compact car derived from the Corolla, manufactured and sold by Toyota. Introduced in 2006, the first generation three/five-door hatchback shared the platform with the E150 series Corolla, while the second generation five-door hatch ...

* 2003-2009 Toyota Avensis * 2005–2010

Scion tC The Scion tC is a compact car manufactured by Toyota under its Scion brand from 2004 to 2016 over two generations: ANT10 (2004–2010) and AGT20 (2010–2016). Both generations were built in Japan. The tC was introduced first in the United States ...

* 2008–2015 Scion xB * 2007-2013 Toyota Mark X ZiO

2AZ-FSE

The 2AZ-FSE is a version. Bore and stroke is , and a compression ratio of 11.0:1. Output is at 5800 rpm with of torque at 3800 rpm. The 2AZ-FSE features Toyota's D-4 direct injection system. * Toyota Avensis

2AZ-FXE

The 2AZ-FXE is an Atkinson cycle variant of the 2AZ-FE. It has the same bore and stroke, but the intake cam and pistons are unique. It has a physical

compression ratio The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

of 12.5:1. The large valve overlap leads to a reduction in cylinder charge and reduced torque and power output, but efficiency is increased. This combination makes the 2AZ-FXE suitable for use only in

hybrid vehicle A hybrid vehicle is one that uses two or more distinct types of power, such as submarines that use diesel when surfaced and batteries when submerged. Other means to store energy include pressurized fluid in hydraulic hybrids. The basic princip ...

s, where peak torque and power demands can be met by the electric motor and

battery Battery most often refers to: * Electric battery, a device that provides electrical power * Battery (crime), a crime involving unlawful physical contact Battery may also refer to: Energy source *Automotive battery, a device to provide power t ...

. Maximum output when used in the Camry hybrid is at 6000 rpm with of torque at 4400 rpm. * Toyota Alphard Hybrid *

Hybrid * 2007–2011

Toyota Camry Hybrid The Toyota Camry (XV50) is a mid-size car produced by Toyota from August 2011 to March 2019. Replacing the XV40 series, the XV50 represents the seventh generation of the Toyota Camry in all markets outside Japan, which follows a different genera ...

AHV40 * 2010–2014

Lexus HS 250h The Lexus HS (Japanese: レクサス・HS, ''Rekusasu HS'') is a dedicated hybrid vehicle introduced by Lexus as a new compact executive car sedan in 2009. Built on the Toyota New MC platform, it is classified as a compact under Japanese regu ...

* 2009–

Toyota Sai The Toyota Sai is a hybrid electric car sharing the same platform and hybrid drivetrain as the Lexus HS. It was launched in Japan on October 20, 2009, following the launch of the Lexus HS in January of the same year. Toyota received about 14,000 ...

References

{{Reflist AZ Straight-four engines Gasoline engines by model