Well that's not confidence building.
Let'em fix it and don't sweat it in the future. It's all on them costwise. Probably a defective area in the metal of the spring maybe.

 

I have been getting push back from long distance fanily members that all the springs should be replace now that the one is being replaced as those springs may be from the same lot as the broken one.

 

If it were me, I think I'd request that the dealer / Toyota provide (at their expense of course) an extended warranty out to say ~10 years, ~100,000 miles, as a start of the discussions.

 

This should be the minimum to ask for. Considering this is only a few weeks old I would consider asking them to replace the vehicle.

Best case they may be able to fix this without pulling the head.
If they cannot, they will either pull the head (major surgery) or replace the engine.

Replacing all springs is a good idea. Due to the amount of labor the dealer would be better off replacing the head assembly.

Let us know how you make out.

 

The service department is telling me that they will only replace the one failed spring. If I want more done it would be my own cost. I have contacted Toyota Brand Engagement Center. They created a case number and are escalating the case.

 

You might want to post this on the Highlander 4th Gen HYBRID page since the engine and valve spring are unique to that model and not the 4th generation V6 model.

 

My new 2023 Highlander Limited Hybird - #3 valve spring Failure.

The other day I went out to move my new 2023 Highlander Limited Hybird with only 175 miles on it.
Upon starting, it was running rough like a misfire I though and the engine was shaking. Warning light and message was given.

"A malfunction in the electronic control of the engine, throttle, or automatic transmission has been detected.
Contact your Toyota dealer to have your vechicle inspected".

I contacted the dealer and had the Highlander towed.

The next day I was told that there was a broken valve spring for the #3 clyinder. I now am concern that there may be more defective valve springs. When I asked the service separtment about the other springs and was told if I wanted them replace it would be on my own expense. I do know there has been been valve spring issues in other models, number of years ago and at one time Toyota had required all springs to be replaced. So after this repair is completed what should I do, be worried about and watch out for?

What are your thoughts

 

It seems like you have already created a thread on this topic. People should go to the other thread that you created for this problem- that way all the comments, ideas, solutions, and so on are all in one post. You already have a few responses there.

Maybe an admin/mod can eliminate this duplicate thread?

 

They can probably replace a spring without pulling the head. It could just be a fluke with that one spring didn't get proper heat treatment and suffering early failure in the field, aka "infant mortality".

If several were to fail, then that's a systemic failure and would require more drastic corrective action; but for now let them swap it out and drive on. You have a good warranty to cover if anything else breaks in the next several years.

 

OP, please, do not create multiple threads on the same topic.
Thank you