Toyota 3MZ-FE Engine Guide: The 3.3L V6 in the Highlander, Sienna, Camry and Lexus RX330

The Toyota 3MZ-FE engine is a 3.3L V6 from the early 2000s. It powers the 2004 to 2007 Highlander, 2004 to 2006 Sienna, Camry Solara, Lexus ES330 and RX330. It makes about 225 to 230 hp and uses a timing belt. Replace that belt every 90,000 miles or nine years.

If you are buying for a replacement, this guide covers specs, fitment, common problems and what to check on a used JDM unit. When you’re ready to compare stock, browse our Toyota and Lexus engines.

What Is the Toyota 3MZ-FE Engine?

The 3MZ-FE belongs to Toyota’s MZ family of V6 engines. It grew out of the older 3.0L version and replaced it in many Camry based vehicles. In the name, MZ marks the engine family, the 3 marks the version, and FE points to a four valve DOHC head with electronic fuel injection.

It’s an all aluminum V6 with cast iron cylinder liners. Toyota added VVT-i, which adjusts intake cam timing as you drive. People know this engine from minivans and crossovers, not sports cars. It runs smooth, pulls well at low rpm and asks for little beyond regular care.

3MZ-FE Specs: 3.3L V6 Power, Torque and Timing Belt Interval

Table shows the core numbers for the 3MZ-FE V6. Power shifts a little by vehicle and model year, so read the figures as a range.

Toyota rated the Sienna at 230 hp and 242 lb-ft, and a MotorWeek road test lists the same figures. The Lexus ES330 came in slightly lower at 225 hp and 240 lb-ft. Hybrid models use a tuned version with different ratings. Don’t compare them directly with the numbers above.

The timing belt deserves the most attention. Toyota and Lexus call for replacement at 90,000 miles or nine years, according to Import Car magazine. That same belt drives the water pump. Technicians usually change both together but some of them also suggest doing the job closer to seven years, which makes sense when a car’s history is unclear.

Which Cars Use the 3MZ-FE: Highlander, Sienna, Camry Solara, Lexus ES330 and RX330

Toyota fitted this V6 to several front drive based models. The table below follows typical US fitment.

We stock matching units for several of these. See the 2004 to 2007 Highlander 3.3L FWD engine, the 2004 to 2006 Sienna 3.3L 2WD engine and the 2004 to 2006 Lexus ES330 3.3L engine.

Check your VIN before you order, though. Some Camry V6 cars from this era carry the 3.0L engine instead. The engine code on your original unit settles the question.

3MZ-FE vs 1MZ-FE: What Toyota Changed

The two engines look alike at a glance. Toyota changed several details when it moved from 3.0L to 3.3L.

• Size: The 3MZ-FE uses a wider bore and keeps the same 83 mm stroke. That takes displacement from 3.0L to 3.3L.

• Compression: It rises from 10.5:1 to 10.8:1 on most versions.

• Power: Lexus moved the ES from 210 hp to 225 hp when it switched to the 3.3L. The Sienna jumped from 210 hp to 230 hp.

• Intake and throttle: The newer engine adds electronic throttle control and a two stage intake system.

• Belt risk: The earlier engine is generally described as non interference. The 3MZ-FE usually isn’t.

On the road, the 3.3L feels stronger at low speed and cruises easily. It still needs the same belt attention, and a bit more of it.

Is the 3MZ-FE Reliable? Common 3MZ-FE Problems

For the most part, yes. Many owners report 200,000 miles or more with regular oil changes. Age causes more trouble today than design does. Rubber parts harden, and gaskets weep. Still, a few issues come up often enough to check.

Oil leaks

Valve cover gaskets are the usual suspect. They harden with age and start to seep. You might smell burning oil or notice light smoke near the exhaust. Camshaft seals and front seals can leak too. These are normal wear items on an engine that’s now 15 to 20 years old.

Timing belt and water pump

A broken belt can bend valves. Most technicians treat this engine as an interference design, and trade reports say VVT-i versions risk piston to valve contact. Ticking, misfires or a check engine light may point to belt trouble. Often, though, a belt gives little warning. A coolant leak near the front cover can also signal a failing water pump.

Sludge and VVT-i trouble

Toyota’s 3.0L V6 earned a sludge reputation. The 3.3L seems less prone to it. Skipped oil changes can still cause problems, though. Sludge may clog oil passages, strain the cams and upset VVT-i operation. Use quality oil and change it on schedule.

FWD vs AWD 3MZ-FE Engines: Fitment Differences

The core engine is the same in front drive and all wheel drive vehicles. Surrounding parts aren’t always identical, however. Engine mounts, brackets and transmission pairing can differ. Always match the engine to your drivetrain.

The Highlander, Sienna and RX330 came in both layouts. The ES330 and Solara were front drive only. That’s why our Highlander listing says FWD and our Sienna listing says 2WD. Send the seller your year, model and drivetrain before you pay.

Hybrids are a separate case. Their engines work with electric motors and carry a different tune. Skip them unless the listing clearly says hybrid.

Buying a Used JDM 3MZ-FE Engine

A JDM engine is a used engine imported from Japan. Many come from lower mileage vehicles, which is the main draw. Even so, ask for proof. A short checklist helps:

• Confirm the engine code and make sure it matches your year, model and drivetrain.

• Ask for photos of the actual unit, not stock images.

• Request the mileage source, such as an auction sheet or odometer photo.

• Ask whether the seller ran or compression tested the engine.

• Find out what’s included, such as manifolds, sensors and wiring.

• Get the warranty terms and shipping details in writing.

Budget for a new belt kit as well. Unless the seller documents a recent belt and water pump change, assume the job is due. It’s cheaper to do it while the engine is out of the car.

Ready to take a look at engines? Check our Toyota and Lexus engines or send us your VIN, and we’ll help you match the right unit.

People Also Ask

What cars have the 3MZ-FE engine?

The 3MZ-FE powers the 2004 to 2007 Toyota Highlander, 2004 to 2006 Sienna, 2004 to 2008 Camry Solara, 2004 to 2006 Lexus ES330 and 2004 to 2006 RX330. Hybrid versions sit in the Highlander Hybrid and RX400h. Some Camry V6 models may use it too, so confirm with your VIN.

Is the 3MZ-FE an interference engine?

Yes because many technicians treat the 3MZ-FE as an interference engine. A trade publication reports that VVT-i versions can risk piston to valve contact if the belt breaks. Treat it that way to stay safe. A broken belt can bend valves, and that repair usually costs far more than a belt kit.

What's the 3MZ-FE timing belt interval?

Toyota and Lexus recommend replacing the belt at 90,000 miles or nine years, whichever comes first. The belt also drives the water pump. Many shops replace the pump and rollers at the same time. If you don’t know the car’s history, consider doing the job sooner.