Don’t take this as a criticism, it isnt. (My tone is very content and pleasant.) If you can get anyone who represents Toyota to document a non-stock tune is both not warranty voiding and epa compliant, I am buying a Toyota.
I certainly agree there are EPA compliant non-OEM tunes. I purchased one and it is documented on their website.
https://greendieselengineering.com/ (GDE)
However, and I certainly could be wrong as I don’t have specific Toyota experience, I would be very surprised if anyone officially representing Toyota was willing to go on record that installing a non-Toyota factory tune is no problem for warranty claims. Again, I am buying a Toyota if that is the case. And, yes, that would make me happy.
GDE has written in your purchase order that installing the tune likely will void the factory warranty. Before you pay you have to acknowledge you know that.
Also, I am confident many tuned vehicles of all makes have been successful in getting repairs done under warranty. I’m guessing they don’t even check tune logs for most repairs. However, I am sure tune logs are checked for major repairs such as failed engines.
The fire department I formerly worked for purchased a 2009 (in 2010) heavy duty GMC truck chassis “off the lot.” It was tuned as a tow truck. We had to have it tuned to GMs emergency vehicle tune. So, using that as an example, manufacturers do offer multiple tunes for the same vehicles. Maybe Toyota does as well for personal preference? If you are not buying it from Toyota, I would be very surprised if it didn’t affect warranty coverage.
By the way, that truck purchased by our FD was a complete POS. It was literally the worst vehicle I have ever had knowledge of. It had a DPF but was before DEF. The emissions system was a total nightmare.
As I recount what I am writing, looks like I am the moron who decided to buy a GM diesel for myself.
(EDIT - going back I realize may have missed something. Did you get the tune from and programmed by the Toyota dealership? If that is the case, regardless of whether it is Toyota approved or not I’d say that receipt should do wonders for getting warranty coverage in the event of a major repair. All of my comments about warranty voiding were based on the assumption you were buying an aftermarket tune.)