Routine warranty visit to service dept...

Probably ignition problem (like a CPS) or short and long term fuel trim tables getting richer and richer. Rich fuel, over time, kills catalyst converters.

 

I would be more concerned that if they don't fix the condition that caused the cat to go bad...you'll just burn through another one.

 

You might as well check your CPS
https://www.tacomaworld.com/threads/diy-check-replace-your-cps-sensor.497659/
A major philosophy in my line of work is to fix the root cause of a problem, not just the symptoms. Seems like the bad cat is a symptom of a problem, not the root cause.

 

Absolutely. Is the cat melted down OP?

 

Was not, just failed.

Told/made him to check it out but checked out ok.

Came out during my lengthy conversation.

 

Not on recall list but, he checked it out and no fault found.

 

Update, truck still in. It was the RH converter that failed.
CPS was not the culprit. There is a notice about converters going out on early 16 models, showed me work history and there was a previous taco in for the same reason..

 

I had one go bad on a Corolla. Covered under warranty, thank goodness. Those things are full of precious metal catalysts.

 

They are also crazy expensive

 

Luckily Cats are warranteed for 8years or 80k miles. I'd imagine the CKP would be covered for 5/60. Maybe Toyota will extend that due to the number of failures.

 

Interesting spin. I bet it was engine management code running the cats too hot.

 

Got the truck back.

 

After that ecm reflash, truck feels great.