FWIW Yesterday, after 8 years and 152K miles, I relinquished my 2010-II back to Toyota...after pulling my aftermarket high dollar sound system out that is. My experience was of this being the most reliable and low TCO vehicle I ever have owned. The biggest difference and benefit the Prius offered was a lifetime 45.7 mpg (real) and nothing broke prematurely like the big 3, VW, and so many other manufactures cars do. ...but you still have to maintain fluids, filters, tire rotations, alignments ect... per industry standards...not the perceived magical Prius standards so many preach here. This also includes struts/shocks/isolators and wheel bearing...which ARE wear items. I will miss her, but she was tired. Now I'm driving the 2015-4 I allowed my Son use of while attending College part 2...so I'll get over it.
i don't mind following the toyota maintenance schedule, and dealing with the other items as problems arise. i would do the egr circuit/intake manifold cleaning around 100k on any gen3 though.
Have your mechanic crack the seal in the egr pipe and take a look. While low on hv miles, that might exacerbate the issues. Only 1 way to find out.
I bet it’s higher carbonization for sure. How much is anybody’s guess. But data helps out. Up for an adventure ?
You’ve got some members close that have undertaken the task. Given your contributions here, I’m sure you’d get help. If you move out here, I’d lend a hand.
IMHO a 150k miles well maintained Prius is still young at heart, and can be a gem for someone looking for a used Prius. Best of luck for her and the next owner.
Being saved for later. Put the stock level II back in. . Son needs a truck and the 2010 was lowest on the pole. Besides...while young at "heart", a 150K mile car needs work/money. Yes...even a Prius. So instead...l'm using that money, money from the sale and a little more to "help" him with his purchase.