Why the Toyota 2ZR Engine was a Failure

Here's a look inside the Toyota 2ZR-FXE engine and how it works!
The Toyota 2ZR engine is a 1.8L 4 cylinder all aluminum engine. The FXE variant was used in the Toyota Prius and Lexus CT200h variant. These engines were known for overheating due to headgasket failures and oil burning causing carbon buildup.
The engine features dual overhead cams with variable valve timing only on the intake side. It has an electric water pump that operates when the vehicle is using electric traction power only, since there are other systems that need to be cooled when the engine is off. Typically, the heat cycling of the hybrid system is what attenuates the head-gasket failures on these engines.
The rest of the engine has a very simple design with port injection, a simple timing chain setup, and hydraulic roller-lifter system for the camshafts.
The use of low tension oil control rings for lower friction has also been attributed to the oil burning issues. Carbon builds up and cannot pass through the very thin rings and as a result, the oil ends up on top of the piston getting burnt through the exhaust as opposed to going back into the sump.
The engine in this video was from a 2012 Lexus CT200h with 290,000km.
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[@joskd8491]

the headgasket problems are caused by either a failing electric waterpump (I replaced mine while it was still in good condition at 230k km's), or a clogged EGR and intakemanifold. Because of this not every cilinders gets the same amount of fresh air mixed with exhaust gasses from the EGR. This causes the 'death rattle'. An important factor is clogging up the EGR is oilconsumption. An oilburning engine produces a lot more carbon, clogging up the EGR and intakemanifold fast. As a preventative matter I change my oil every 10k km's and every 80k km's I clean the EGR and intakemanifold. It's quite a job but for me it pays off. Mine has 236k km's now and burns no oil. With this extra service and maintenance it's a very reliable and durable engine. I think the first Prius's form 2009 - 2013 have the oilburning problems because of the tiny oilcontrolrings. From 2013 they don't burn oil anymore (so I'm told)

[@speedkar99]

Awesome. How exactly are you cleaning the intake manifold? Scrubbing it with a toothbrush?

[@one_mega_ohm9139]

While those things certainly exacerbate the issue, the main problem is that the head gasket itself is complete garbage. Single layer, with a crappy coating. Even with water pump and EGR maintenance I bet yours blows by 370k km. They all do eventually. If they used multi layer steel from the get-go then I doubt it would have been an issue.

[@joskd8491]

@@speedkar99 I'm using ovencleaner. It works very well. spray it, wait a while, and spray it again and again. Every now and then flush it with water, let dirty black water out, dry it and spray again. In a day or so, it's clean like new. Both intakemanifold and EGR.

[@joskd8491]

@@one_mega_ohm9139 I don't know, but I'm sure you're right. If it blows, it blows. But if it happens I replace it with an upgradet one like you say. Do these engines have a worse headgasket than the 1,8 engines used in the Corolla?

[@kgahlisomatlalakm]

​​@@joskd8491 I'd also like to know, I have a 2014 1ZR 1.6 corolla that I use as an uber car in South Africa with 432k km, bought it at 56k km, no major issues, just the alternator bearing gave out at around 280k, my local toyota dealership wanted to replace the alternator for $400, so I bought a bearing for $30 at an auto electric shop, still going strong, no oil burning issues, engine still pulls strong. The cvt transmission is still as smooth as new, I change the CVT fluid every 80k km.

[@Z7d3nR4]

Sirens are probably because his wife called to report that someone stole her dress while she was in the shower.

[@ianriggs]

😂

[@speedkar99]

It was so timely!

[@gacherumburu9958]

😂😂

[@god_of_negativity9297]

EGR-System does not reburn the exhaust gas contrary to popular belief. Instead the exhaust gas is being rerouted back into the cylinders through the intake ports and it mixes with the intake air taking out some of the oxygen being sucked in, through which the combustion temperature is being lowered and ultimately the NOx emissions are being lowered. Also the Atkinson cycle engine does not reuse the exhaust gas, but it rather lets the intake valves open for a lot longer even though the pistons are already in the compression stroke, this allows for the engine to reach higher expansion ratio during the combustion from the much lower dynamic compression ratio which in term allows for higher efficiency. Those engines usually have a very high mechanical compression ratio for a petrol engine, but of course it is lowered through the intake valve timing. Either way, your videos are very interesting, keep up the good work. 😁

[@craigiefconcert6493]

Everything looked pretty much brand new in that engine. I guess there’s probably a different set of pistons available due to the technical bulletin. With a ring job and a new head gasket, new valve stem seals, send the head to a machine shop to check out the seats and tolerances etc, the engine would be practically brand new. The battery is probably defunct or not much life left. Let’s say you did 7.5k km oil changes instead of the probably recommended 15k km. That is 10 changes on 150k km’s. If you do it yourself that’s about $500 using synthetic oil bought on sale. Over 300k km’s that’s $1000. These extended oil change intervals are penny wise pound foolish.

[@speedkar99]

I agree...oil changes definitely help, however if an engine has an inherit design issue it'll be bound to fail at some point. They put these low tension rings to help with fuel economy because it's a Lexus Prius.

[@pottasium7117]

Very informative and well presented video. Im working as a technician yet never knew this was an issue inherent to 2zr

[@speedkar99]

Thanks and glad you learned something

[@chonglers1513]

Thank you for the information. Almost bought a prius with this engine and I had no idea this was an issue

[@speedkar99]

Big issue with the 2010+ Prius

[@user-iv7yp1qs6v]

Love your videos. Keep em coming. Great job.

[@speedkar99]

Thanks, will do!

[@maikelnait4495]

Both educational and entertaining! Perfect 👍

[@speedkar99]

Thanks! 😃

[@jamesmedina2062]

Excellent video my man. Cheers!

[@speedkar99]

Thanks I appreciate it

[@michaelbezoski3096]

The truth shall set you free. In reference to the oil checking, oil replacement. Totally agree bro. Some funny quips their too. Really enjoy the human side of your videos and those explanations. Very informative. Thank you.

[@speedkar99]

You are welcome.

[@padillaxA]

I love that most problems with toyota engines are a product of use case and not design flaw. And furthermore they typically dont arise early and provide a reasonable service life before any issue. Oil rings here are unfortunate but its common across the board now in the unnecessary pursuit of that extra decimal point of efficiency

[@JasonLuther1]

Best explanations out there

[@oscarlmolina]

Great video!

[@speedkar99]

Glad you enjoyed it

[@imnotusingmyrealname4566]

I'm sensing a pattern here. The engines ending in Z generally seem better than their successors ending in R.

[@speedkar99]

Yeah the 1ZZ and 1NZ were good reliable engines 2AZ had some issues though

[@someguyintexas1053]

@@speedkar99 Throwing my vote in for a 1NZ teardown. Ours has 300k mi and still alive. Would love to see what I'm in for when the day comes we need to rebuild it. 🙂

[@Josh91810]

@@someguyintexas1053yes please. 1nz tear down. My 07 Yaris has 334K miles. It doesn't burn oil. Very reliable engine.

[@mitch9521]

@@someguyintexas1053 Gotta find a dead one first lmao

[@Clintondmb]

Another great video. Just recently did the EGR and intake service for my girlfriends CT200h. I I make have missed it but have you done a 1NZ motor before?

[@speedkar99]

Yes, check my Prius teardown videos

[@kclyt07]

Always informative and educational. I can't understand Toyota design of those oil rings burning oil. I remember nightmares with 2AZ-FE. p.s.: may I ask the model number of your Milwaukee impact driver used in this video?

[@speedkar99]

I don't remember the model number...28xx something...I don't feel like it's strong enough

[@florianrubner7906]

love your videos

[@speedkar99]

Thanks

[@morrij01]

The head gasket on my parent's old 2010 Corolla failed after less than 6 years and less than 100k kms. Luckily, it was covered under the extended warranty, but that shouldn't happen on a Toyota.

[@speedkar99]

How much would have been the repair?

[@morrij01]

@speedkar99 this was back in 2016, obviously, around $1600 at the dealer in the Montreal area.

[@morrij01]

@speedkar99 I actually just talked to my dad and he was told that they would have charged him $2500 for the job. He had brought it in 2 weeks before the warranty was up for a complete check-up and that's when they found it.

[@CJinSD1]

I ran an all makes shop in a college town for a couple of years. We had dozens of customers with Priuses. The only one that ever had an engine issue was down to being driven without oil. When I went to buy a used engine to replace it, they were literally $100 a piece. There are so many more wrecked Priuses than there are Priuses with engine problems that the engines sell for scrap prices. There is no greater proof of engine quality than that. It is the terrible engines that are expensive in the used auto parts business. Try buying a 4.7 for a Jeep, or a Subaru engine, or a Ford Triton or Ecoboost. You'll find people fighting over them, because they fail all the time and there aren't enough coming out of totaled vehicles to cover the failure rate.

[@speedkar99]

Awesome! Where can I find $100 engines? I'd be tearing them down all day

[@lmb5529bml]

I have a 2012 Corolla in my family with 204500km on it. It is the 2ZR-FBE though, flex fuel for Brazil where I live. Have it since 160k km and just regular maintenance, but people take waaaay better care of cars and oil changes here in Brazil so there's that. Also, the Toyota dealership oil for this engine is 10w30 conventional. And it works fine and is completely reliable through 10k recommended oil changes and higher temperatures we see here in summer.

[@James-vt2cb]

Everyone should be running thicker oil than 0w20 water. Sounds like you're having easy success with careful maintenance.

[@lmb5529bml]

@@James-vt2cb No problems whatsoever and only smooth running.

[@speedkar99]

I remember the older days when 10W30 was the norm especially in summer. We can't even find that for sale around here anymore

[@soothsayer2406]

Love the police siren perfectly timed and queued, when you mentioned your wife's dress to be used as an oil rag skit.

[@speedkar99]

I noticed that in editing! Good timing haha It was a fire truck

[@cluelessbeekeeping1322]

I love your channel!

[@speedkar99]

Thank you so much!

[@1verstapp]

''we made it cheap to build, not easy to maintain.'' - engineers probably.

[@anubaral]

more like accountants

[@NickAlexander_is_Awesome]

To their credit, they did use aluminum valve covers and timing covers instead of plastic.

[@James-vt2cb]

I've had two close family members with the 2ZR Prius. The 2011 had oil changes every 3k miles or 6 months, and never burned a drop of oil at 57k miles. Admittedly, that's really low mileage. It was traded to Carvana during the pandemic for an astonishing amount. The 2012 sticks closer to Toyota's recommended intervals, so they cart around big jugs of oil everywhere they go. Before they knew it was a real problem, at about 180k miles, the car displayed the "low engine oil pressure" warning. She was on the highway and decided to "get to town," and drove for another 20 or so miles! Today, 50k miles later, the thing still runs very well, and still burns oil. Despite the big design flaw, it seems that these still run forever. Perhaps that's because they can motor along on the highway with low oil pressure, who knows.

[@Erichhh]

I'm at 112,000 miles and my 2010 has never needed oil between 5k changes with synthetic 0W20. At the 5k change point it's difficult to see the oil on the dipstick because it's still so clean.

[@speedkar99]

Remember half the time these engines are off while in hybrid mode, so that mileage isn't true for that engine the way it would be on a gas only car.

[@rickymac54321]

The 2ZR-FAE on 12th Corolla LE (20-22) has a spin on oil filter. I wonder why they switched from cartridge style filters.

[@iangathura3516]

Best engine design apart from the oil control ring. But they changed that. Best engine in the world. My dad's car still runs after 34 years. 🇰🇪 (From Kenya)

[@auntbarbara5576]

7:49 nice! 👌

[@speedkar99]

🚨🚨

[@TheCRTman]

The 2ZR-FE in the 2011-2013 Corolla I think is an excellent engine. My 2013 has 227,000 miles so far. The 2ZR-FXE in the Prius's on the other hand.... not so good.

[@speedkar99]

It sure is. The hybrids were the one that gave it the bad name

[@delanechigwangwa4120]

Great video ! ,Planning to get a toyota mark x GRX130/135 2.5l 2015 or later variant or a Corolla axio 2015 or later which one is likely to give me less problems like the ones you mentioned in this video

[@speedkar99]

The 2.5 burns oil too doesn't it ?

[@delanechigwangwa4120]

@@speedkar99 not sure ,still weighing the options .i have never owned any of these cars

[@SplosionMovies]

If you ever come across a Nissan MR20DE I'd love to see what you think of it. Rocking one in the daily and when I went to do valve cover gaskets @150k miles, it looked great. No one seems to have anything to say about them either way, but I think they're good little runners.

[@barron204]

Have the same engine in one of my cars. Been good so far.

[@speedkar99]

Yes I already have an MR engine teardown from a Juke

[@CanielDonrad]

Have a 2012 matrix with 2zr fe. I dont know if the rings it uses are different but I havent had the issues others have had with the 2zr platform. I also had the gasket replaced around 125k just to be on the safe side, didnt have any coolant issues. Never see the oil leaks from tensioner like the zz's. Never dealt with water pump issues, but its also the non-hybrid and Ive only ever see the hybrid pump fail. Window tracks have failed twice though lol

[@speedkar99]

The 2ZRfe was more reliable. It doesn't have the heat cycling, EGR or water pump drawbacks that the hybrid motor has. Did you replace the head gasket or valve cover gasket?

[@emotionz3]

Why did they replace the engine? I helped a buddy with a head gasket (and battery pack replacement) on a Prius he bought at auction a few years ago and honestly the battery pack was more work. The engine was in really good shape for 150k. We ran an oil flush through it and change the coolant twice (there was oil in the cooling system) burned no oil!

[@speedkar99]

Why is the battery more work, isn't it just a unit that lifts out the trunk? I've removed one, as long as you're cautious and have the correct scan tools it doesn't seem too difficult.

[@vaguefilms]

7:47 the police siren was a paid actor

[@speedkar99]

It was so timely 😂

[@jacktheripper1083]

i would rebuild that motor, just did an old 7M-GE last week 300 000kms, just a new head gasket and head set, a good diesel rinse of the bottom end, and what do you know, brand spanking new again

[@speedkar99]

Good to know. My brother is rebuilding his 7M-GTE for his Supra

[@bonganihalimani9572]

Will these rebuilt hybrid engines run perfectly?

[@Thunderkorn]

I have a 2020 corola le with this engine. 135,000 miles bought it used at 100,000 is there anything that I should be worried about? Been changing my oil every 3k miles and trans every 35,000 miles.

[@JohnSmith-yv6eq]

Keep doing what you are doing... if this engine went 290k kms...(180,000 miles) and was obviously burning oil well before the HG blew.. you should have warning (oil consumption) of possible impending failure if you keep up the oil changes (3k is great) that may extend that life as another commenter says his is still perfect @ 370000 miles! How long do you intend to keep yours?

[@speedkar99]

Remember hybrids have the engine off half the time so 290km isn't exactly the true engine mileage

[@speedkar99]

The gas only version of this engine didn't suffer from nearly as much issues as the hybrid.

[@bradhuffjr777]

I have that same engine in my car, but it doesn't have those yellow caps on it.

[@AR-pm9nv]

Like when you wake up on a Thursday afternoon….🤣

[@speedkar99]

Sticky sticky

[@DavyydGosselin]

Top of his game!

[@speedkar99]

🙂

[@colchronic]

I'm not sure what you're talking about M12 triple square works absolutely fine on Toyota head bolts as long as you spray brake clean on the bolt heads I've taken apart so many heads and put them back on with m12 triple square and never had any issues

[@speedkar99]

I've stripped one or two with both triple square and hex After that I just bought the correct tool

[@colchronic]

@@speedkar99 huh that's interesting yeah I don't know I just use a sunex m12

[@colchronic]

@@speedkar99 also I do not use an impact gun for them I use a breaker bar

[@peterpanini96]

My voswagen oil dipstick is trolling me... do the dkza engine sometimes pls...

[@Sr.Dusty-Leon008-da-III]

I want to see you take apart the new Mazda CX 90 engine

[@jrodificator1]

the stamped steel oil pans are usually galvanized and then painted, I've never seen one rust before -

[@speedkar99]

They rust...here in Canada !

[@jamulrichbuzeze3049]

Another great teardown video. I need these junkyard Toyota engines for export to Africa

[@speedkar99]

Thanks. Do you rebuild them?

[@jamulrichbuzeze3049]

@@speedkar99 Depending on how severe the failure is will determine if we rebuild or sell as it is. If possible to have a 40ft container loaded with used engines, suspension parts, body parts and used tyres . That is what I'm looking for

[@itswais77]

7:45 as soon you mention your wife’s clean shirt, the police sirens start ringing

[@mitch9521]

Wild. I've seen these with half a million miles on them.

[@speedkar99]

The hybrids?

[@Aleks_Mechanics]

Notification Squad!🔥🔥🔥

[@speedkar99]

Thanks

[@transmitterguy478]

So, If I made a sprayer that sprayed antifreeze into the intake of my RAM 5.7 Hemi it would keep the pistons clean?

[@JohnSmith-yv6eq]

Might as well coil thin coper tube around the exhaust manifold and use a windscreen washer pump to push straight water through the tubing.. creating a steam spray into the intake to clean out the runners. Just use this when cruising... and remember to turn it off well before you shut the engine off... otherwise rust/hydro locking could occur?

[@speedkar99]

Yes, Some people do that as a supposed cleaning routine.

[@markamd1]

What is with the Tooth brush?

[@speedkar99]

My teach brush

[@markamd1]

@@speedkar99 Teach brush? Couldn't think of anything else? 😂

[@kclefthanded427]

Mini Cooper chain giudes are made from milk cartons

[@James-vt2cb]

Mini Coopers are made from milk cartons.

[@speedkar99]

Big time

[@CarloLeonKolega]

Do you refurbish the engine or throw it?

[@JohnSmith-yv6eq]

The way the parts were piled and parts were thrown....bye bye engine!

[@tylough]

You get a used one from a wrecked toyota

[@speedkar99]

Scrapped

[@davispresbhj2418]

I mean ive actually only seen ONE of these 2ZRs blow a headgasket in almost 5 years at a dealership. it blew cuz the customer put lucas oil stabilizer in it. the Corolla is a great example, these motors dont usually have issues. Toyota 4 cyl, almost across the board will burn boat loads of oil later on in life if you listen to the stupid 10k mile oil change BS

[@speedkar99]

Yeah they're oil burners....but why would Lucas cause it to blow?

[@davispresbhj2418]

@@speedkar99 it took 0w20 oil, they added the thick Lucas shit to a motor that was already burning oil, it starved the bearings and threw a rod

[@TheCloser1]

Those roller rocker arms should be illegal … ahem! Chrysler 3.6

[@speedkar99]

Hahaha

[@unclejoe6811]

Toyota has been slipping in quality, it's not the Toyota of the mid 1990's and early 2000's that was stellar.

[@speedkar99]

Toyota if the mid 90's were overbuilt. They've optimized things now and that's changed alot of customer expectations

[@joelh3030]

My 2zrfe doesnt have an EGR valve

[@speedkar99]

Because it's not a hybrid

[@joelh3030]

@@speedkar99 not, its a 2ZR-FE. You might have a different head here. 2012 corolla s. No egr whatsoever just a normal setup.

[@herniagaming]

​@@joelh3030there are different engines that's why yours is a 2zr fe this one is a 2zr fxe

[@wayneknodel3347]

Do you have a graveyard with markers for each of these engines that took its last breath? Some should be buried deeper than others! This one led such a charmed life and yet was taken down by the crappy oem rings and a leaky gasket. Pity!

[@speedkar99]

Yeah my backyard is the graveyard lol

[@orac229]

I detect someone likes simple well made Toyota engines with little plastic.

[@speedkar99]

Yes!

[@fa5k206]

6:00 Can I have them? hahaha

[@andypeterson2126]

Dah wuz cool

[@speedkar99]

Thanks

[@RtCmdr]

Why did you have to tape over the name on your gloves? Did U-Line complain?

[@jonnycando]

They are not paying for the exposure!

[@speedkar99]

True

[@speedkar99]

I didn't even notice

[@tuananhcdtbk]

This engine seem to be simple design than my honda k20 engine.

[@speedkar99]

Yes it's simpler but the k20 will out last this

[@Zgronar]

Moment i heard "electric water pump" i knew why head gasket was blown

[@speedkar99]

It's more about the heat cycling and materials used.

[@johnw3379]

May I please have the cam rockers? Lol

[@speedkar99]

I don't have them any more 😢

[@anubaral]

the only downside i can see is that bullshido 0w20 oil that ends up burning

[@speedkar99]

And the catalytic converter that gets roasted with that burning oil

[@geoghs02]

Nice April fools joke! Saying "zee" instead of "zed" was hilarious!

[@speedkar99]

I'm Canadian but completed my alphabets in America.

[@geoghs02]

@@speedkar99 I'm still working on completing mine. I got to "N" and ended up saying "NO" to the rest of it.

[@1uch1n11]

can definitely agree... people are stupid!

[@speedkar99]

In addition to the engine defect it sure does add up

[@WouterB76]

Rant..maybe..but the hard truth also.

[@speedkar99]

Hard truth that Toyota fans don't want to admit 🤣

[@peterpanini96]

Im gona scan the corolla hybrid for issues... 😂

[@barrycrosby8602]

An engine designed by engineers unlike than the rest of the automotive industry who use accountants in their engine design

[@gjm456]

Hard to complain with that high of mileage ???

[@JohnSmith-yv6eq]

That is not high mileage considering the mileage 1990s Corollas went.. and some are still going!

[@gjm456]

@@JohnSmith-yv6eq Agree. It shouldn't be compared to many Kia s and the like.

[@speedkar99]

Remember hybrids spend half their time with the engine off when in hybrid mode. So that mileage is alot lower on the engine compared to a gas only car.

[@herniagaming]

Toyota need to fix ring desing lol, they fucjing love to burn oil

[@saultube44]

@7:45 Wife ratted him out to the Police, he came back after giving his credit card to his wife 😊 Very interesting, not much damage to the Aluminum Engine after 290K Km; I thought those engines were crap. So that engine is done?, even if you change the pistons to better new 1s? You don't repair them? Junk yard?

[@speedkar99]

The sirens were very timely! And yes you can rebuild them. I don't

[@saultube44]

@@speedkar99😁yes OK.

[@Psych0technic]

A video of someone actually trashing Toyota engine for a change?! Say it ain't so.

[@speedkar99]

🤣🤣

[@zijie-he]

I am not a native speaker, and i turned on caption to ensure i didn't hear it wrong. Yes, 290k kms for a toyota is not acceptable.

[@speedkar99]

Agreed.

[@peterpanini96]

French engines don't last even that... 😂😂😂

[@bobblick7963]

Don't know why you dis on EGR. It allows engines to run leaner without pinging, and less NOx emissions, so less acid rain. It's a win-win situation.

[@speedkar99]

It clogs up and causes carbon issues.

[@mannys9130]

When designed properly, EGR systems do not clog up and do not cause carbon fouling. The majority of poor EGR designs have some things in common; poor PCV oil separation, small EGR port passages, and excessive oil burning. The oil mist mixes with exhaust and cokes up the intake. Small passages clog up easier than large ones. Oil burning in the cylinders makes a lot more carbon particulate right from the get-go. EGR is a great thing when executed properly. Placing an PCV oil catch can in the breather line will catch a large amount of the oil mist that would otherwise foul the intake manifold. They are easy to build DIY and very easy to install. Drain it twice every OCI and you're good to go. With today's DI engines requiring walnut blasting every 50-100k miles anyway, it's not a huge conundrum to clean the intake of EGR particulate while it's off the engine. I agree that the reduction in NOx, CO, and unburned hydrocarbons is a benefit well worth the slight complications that may arise. 🤷🏼‍♂️

[@nerd1000ify]

On a spark ignited engine the EGR also saves fuel by reducing pumping work at part load.

[@lukotemihango5394]

so why not only change the head gasket and keep that engine running 🤔

[@JohnSmith-yv6eq]

The rings would have to be replaced with the later modified ones, the EGR would need cleaning out, all O rings replaced, ..the whole teardown, parts and labour exceed the cost of a good used engine. But hey if you do it at home for only parts cost...go for it!

[@KennyboyGM]

The engine is not worth the cost of replacing the head gasket.

[@speedkar99]

Then I wouldn't have a full teardown video for y'all right

[@michaelplouffe6913]

Most new cars don’t come with a dip stick

[@JohnSmith-yv6eq]

Just the one behind the wheel???

[@speedkar99]

Sad. Not only does it indicate oil level, but also the oil quality.