Change camshaft and other parts.

no need to do anything. there is a timing chain inspection cover iirc. how many km's on her?

 

Where are those “Just drive it” replies? Starting to miss them.

 

Good time for EGR cleaning, Intake Manifold cleaning, and consider an Oil Catch Can install.

The simplest way to see where you're at, is to check the degree of carbon build up in the EGR pipe, a stainless steel connecting pipe between the EGR valve and intake manifold. Watch @NutzAboutBolts video #16 here:

Nutz About Bolts Prius Maintenance Videos | PriusChat

Two or three other videos linked there too, for the full cleaning of the intake manifold, full EGR clean, and Oil Catch Can install.

Good thread:

EGR & Intake Manifold Clean Results | PriusChat

Another:

Oil Catch Can, Eliminate that knock! | PriusChat

Some tools worth having:

E8 Torx socket (mandatory)
E6 Torx socket (optional, but good to have, to remove the throttle body studs from intake manifold)
3/8" ratchet wrench, regular and long handle, flex head, you can never have enough
1/4" ratchet wrench, or 3/8" to 1/4" reducer
Ratchet extensions: you can never have enough
Long needle nose piers, straight and bent tip
Ratcheting 12mm box wrench (optional, but makes disconnection of the EGR cooler from exhaust easier)
Torque wrench (3/8" and 1/4" both good to have)
Floor jack and safety stands (or ramps): basically some method to raise front, if you need to take underpanel off, which you may need to, both for access and to recover dropped items.

 

there's a shortage of prius camshafts right now, they might be back on the list next year....

 

its a fiat, what do you expect? everything is on the list

 

If you want a fiat to go over 100,000 miles, you change cams.

If you want a Prius turd gen to go over 200,000 miles, you clean the egr.

Apples vs oranges.