My guess (I could be wrong) is it is related to all the supply chain issues and not a high failure rate. I take anything a dealership tells me with a huge grain of salt.
I do wish more dealers/mechanics were more familiar with the proper flush procedures.
Pretty much everything is on backorder and twice the price. Chip or no chip you just can't get a lot of stuff.
Why stock a part that is never needed? Same with the kdss pressure system. It is rarely needed.
We know the total count of pumps is low because dealer inventory shows how many are in the total system and it is almost always zero. A part in high repeat demand would not look like that in a Toyota supply chain. There are always enough radiators and starters for example
Well, this is Toyota we’re talking about. King of supply chain management. No way will Toyota let an important part go to ZERO nationally/worldwide in its stock.