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The Toyota AZ engine family is a straight-4 piston engine series. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium DOHC cylinder heads. 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 626 mm (25-in) long, 608 mm (24-in) wide, and 681 mm (27-in) 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 and a stamped oil pan. The forged steel crankshaft 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 8.0 mm (0.3-in) 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 34.0 mm (1.3 in) for intake and 29.5 mm (1.2 in) for exhaust, with 8.0 mm (0.3-in) 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 0.18 mm (0.01 in) 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 (3.5 L (214 in3) volume including a 1.3 L (79 in3) resonator). Exhaust manifolds are of tubular construction with integrated catalytic converters.

The AZ is the replacement for the S engine. It will eventually be replaced by the AR engine.

2AZ-FE

The 2AZ-FE is a 2.4 L (2362 cc) version built in Japan and at TMMK in the USA, obtains a total displacement of 2362 cm³ with 88.5 mm (3.5 in) bore and 96.0 mm (3.8 in) stroke, with a compression ratio of 9.6:1. Output is 157 hp (117 kW) at 5600 rpm with 162 ft·lbf (220 N·m) of torque at 4000 rpm. Output for the 2007 Toyota Camry is 158 hp (118 kW) and 161 lft·lbf of torque; 2005-06 Scion tCs were rated at 160 hp (120 kW) and 163 lft·lbf.

2007+ versions of the 2AZ-FE engine were upgraded with 9.8:1 compression ratio, a slightly more aggressive intake cam profile, 6500 rpm red line, and piston oil squirters. Rated at 161 hp (120 kW) they are considered slightly underrated based on dynamometer measurements, and are made in Japan for MY2007-10 Scion tC. A 166 hp (124 kW) version is in the MY2006+ Rav4. This engine is available for the Toyota Matrix and Pontiac Vibe twins as well as the Toyota Corolla beginning in the 2009 model year, replacing the 2ZZ-GE as the "XRS" engine in the Corolla/Matrix and Vibe GT.

A TRD supercharger was available on the Scion tC, discontinued in Spring 2009.

Applications:

    * 2002–2009 Toyota Camry
    * 2009– Toyota Matrix
    * 2009–2010 Pontiac Vibe
    * 2009– Toyota Corolla
    * 2002–2009 Toyota Camry Solara
    * 2004–2008 Toyota RAV4
    * 2001–2008 Toyota Highlander/Kluger
    * Toyota Estima / Toyota Previa / Toyota Tarago
    * Toyota Alphard
    * Toyota Blade
    * Toyota Avensis
    * 2005–2010 Scion tC
    * 2008– Scion xB

The 2007 Toyota RAV4 produces 166 hp (123 kW) at 6000 rpm and 165 ft·lbf (224 N·m) of torque at 4000 rpm

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