2010 Prius IV 167K

I’d definitely do engine water pump, and thermostat; water pumps have been reported failing here, around 150k miles. And the thermostat not much, $30~40 USD iirc.

also consider inverter water pump replacement, sometime. Main issue though, it’s very difficult to remove, apparently you HAVE to remove inverter, no way around it. See video #28 here:

Nutz About Bolts Prius Maintenance Videos | PriusChat

With 167k miles, the timely EGR-cleaning ship had long since sailed. My 2 cents: cleaning is needed at least every 50k miles, to keep it operating as intended, and avoiding head gasket failure.

I’d do it, ASAP, but don’t kid yourself, head gasket may let go, before long.

The EGR cooler will be a bear, I’d consider sodium hydroxide (or potassium hydroxide) solution, JUST for the cooler. With appropriate safety precautions. One end hole of the cooler is ~21mm ID. Plug with #4 stopper, pour in solution (about a cup) prop in corner of laundry sink for about an hour, rinse and repeat as needed.

For the rest, EGR valve, pipe between EGR valve and intake manifold, AND the intake manifold (has EGR passages), brake cleaner, brushes and rags, will be effective enough. Also, the aforementioned caustic solutions will be damaging for anything not 100% stainless steel. So basically, just use it on the cooler.

again, EGR cleaning now is a case of better late than never, but I’d start reading up on head gasket replacement.

more info in my signature. (On a phone turn it landscape to see signatures)

 

The Aisin WPT190 is apparently the pump Toyota's using. When I look at RockAuto, the asking price is $280.43 CDN, before shipping:

AISIN WPT190 Water Pump | Shop Now at RockAuto

If I look up the water pump at Amayama, they're offering both the Toyota badged and the Aisin. The latter for me is $138.18 CDN plus $37.10 CDN (from Japan). The "genuine Toyota" is $370.12 CDN plus $43.30 CDN shipping (from UAE):

Buy Genuine Toyota 161A039015 (161A0-39015) Pump Assy, Engine Water. Prices, fast shipping, photos, weight - Amayama

If I take the genuine Toyota part no:

161A0-39015

And searching for that on Toyota USA's part site yields suggested retail price of $367.74 USD:

Electric Water Pump Assembly #161A0-29015 | Autoparts.toyota.com

Putting an Olathe zip code and checking dealership local to you (Legend Toyota), is exactly the same price:

Electric Water Pump Assembly #161A0-29015 | Autoparts.toyota.com

Looks like Amamaya's Aisin WPT190 is the best option. One caveat: I haven't bought anything from them since you-know-who moved into the White House. In past I've made purchases from them, almost this amount and paid nothing more than shipping, no sales tax, no import duties. Not sure if that's still applicable. You could message them to check.

 

No clue. Maybe others will weigh in. I usually figure to stck with Toyota, with the engine water pump, and I think inverter water pump as well, Aisin is the manufacturer, and equal in quality. Assuming not counterfeit.

From my notes, double check though:

Engine water pump:
Toyota p/n: 161A0-29015
Aisin p/n: WPT-190
Inverter water pump:
Toyota p/n: G9020-47031
Aisin p/n: WQT-001