The tsb calls for a new engine head (they specifically made it because they knew the original ones were faulty) for the models with cylinder deactivation. Its gonna cost about $5000 to fix it

 

Ok well then that is not the service advisor I thought it was. Sorry you did not give which TSB number you were referencing. There are a few having to do with oil issues.

Independently you can still get it done for considerably less. Depending on the condition of the head it may be rebuildable? I would recommend contacting a few service shops and get a price to R&R the head which will include having the head sent out to their local shop that does machining and heads and or rebuilds them. They will pressure test the head and completely rebuild it. Then the shop only needs to re-install it. You may even get a nice guarantee to go along with the head and maybe even cover partial labor should something go wrong with it during the warranty period.
However, doing nothing will cause other engine and exhaust parts to become damaged which may add to the cost to fix everything?

 

Y'know, I believe in the KISS approach to auto maintenance--Keep It Simple, Stupid.

That means I drive home from the oil change and immediately check the oil, just to confirm that there's enough showing on the dipstick. I also do that virtually every time I fill up with fuel.
When I checked after my latest oil change, I noticed that the oil was not up to its usual place on the dipstick. So the next day I returned to the garage that did the oil change and asked them to check it. They verified that it was too low. They put the car on the rack and checked the drain plug. It was tight, they said. They apologized, added a quart or so of oil, and we checked the oil level again: right where it should have been. I also checked it when I arrived home--ditto.

I also carry a spare quart of oil in the car so I can add oil if needed.

Old sayings work: better safe than sorry; a stitch in time saves nine, KISS.

Your mileage may vary,

MiltB. Pompano Beach, FL

 

Parts from Mazda as well many auto manufactures' have been on back order for almost and in some cases over a year.
Cylinder Heads specifically can be seen out of stock as one example..

 

Unfortunately, under some regulation and I think laws vehicles under warrnanty for any parts those prs must be listed for the exact VIN and other vehicle information. if even a simple clamp is on back order before it can be used under a warranty service must first be approved. This is actually if you think about it common sense. Should the warranty work fail, and it was found that some parts were used not listed for the VIN the auto manufacture or dealer would have to be responsible for the damages or to re-due the previous warranty service.

National chin body shops are having trouble getting not only body parts but also running gear prs for insurance work that either specifies OEM replacement parts or are only available with the OEM.

Reference to verify or learn more about the parts shotages information:
FIX AUTO - Auto Body Shop, Collision Repair Experts
Mazda USA Official Site | Cars, SUVs & Crossovers | Mazda USA

 

I have a Japan built 2019 Mazda3 with CD and the head just went. Same issue I see people having. Dealer said 4 models all with 2.5 Cylinder Deactivation are included. They had 4 cars in the shop with the same issue. About 80,000km on the odometer and always dealer serviced and driven well.

They're really good about fixing the problem under warranty and the service from Mazda is great. I was planning to buy it out after the lease, but seeing how Mazda is quiet and not proactive about this common issue hinders my trust in the company. I have a year to decide.

 

Was it the typical large quantity of oil leaking out the back of the head? Did they by any chance show or give you any pictures of the damaged area on your vehicle?

 

Not sure why they would need to do that? And I am sure they would not really want that anyway? This was not a safety issues and simply MADZA doing a warranty service repair. i

 

Mine just cracked too, but they don't say much,
they said maybe a couple weeks to fix it.

did anything else get damaged on yours?
How long is the new cylinder head warrantied for?
does the new one have the same problems?
what gets replaced with it?
read there are other things wrong and rocker arm, gasket leaks hydraulic lash adjuster problems. do these get replaced too?
Is it safe for dealer to fix this or should I get some engine shop?
Will Mazda pay for engine shop to fix it ?
any problems since you had yours fixed?
did you sell the car?
should i just fix it and sell it ?

sorry for all the questions. have been trying to read alot of forums and reddits on the problem. this car was alot of money for me and don't know if i should just get rid of it.

 

I thought they would just put in a new engine.
do they replace everything with a head replacement ?
saw there are rocker arm and hydraulic lash adjuster problems
do these get replaced too?
or do they re-use the valves, rocker arms lash adjusters, etc ?