Is it worth saving? P0A0F code!

That engine is the poster boy for a steamed clean piston with its dirty but healthy brothers standing by.

I would guess your 2014 had a production date of Feb 2014 or later with revised pistons and rings. That alone will keep the egr cooler clear.

 

Keep its namesake in mind: any amount of carbon is an effective insulator. Cleaning tips in top two links in my signature (on a phone turn it landscape to see signatures). If Oxi-clean soaks are cutting it, consider lye solution, just on the cooler. Use caution handling the stuff though.

and of course deal with the rest, including the intake manifold with its EGR passages.

carbon happens, regardless of your piston ring variety.

 

I haven’t tried lye solution myself yet, but would wager it’s just up the street from oven cleaner, albeit stronger. Crystal lye (sodium hydroxide) is readily available through Amazon.ca, but not so much on Amazon.com. It’s essential ingredient in soap making, and apparently also for methamphetamine production, which is the likely reason for its US scarcity. It also used to be a common grocery or hardware store item, but not of late.

 

Yeah I'm thinking to try that next time. Let me know if yours starts smoking...

Seriously, I think you should be ok. Toyota at least had the sense to make that thing from stainless steel.

 

Did you also read this one in the Toyotatech section.
Diagnosing Prius Hybrid Battery Pack - Automotive Tech Info
"sometimes what they don't tell ya about the process as explained in the manual (ie: 4amps to 60% SOC)
can result in, yes you guessed it !

Not that there's anything inherently wrong with the process, if a busy shop that only needs to get the ICE on.

The charger in the article we read doesn't appear on the manufactures web site any more.
They may still stock them, but with the data logger for a laptop and consulting service of the logs I'm pretty sure if they do still have them they're not gonna be cheap.
Zivan Charger Sales & Service and GEM Charger Repair

 

If it was my car, I would not take the chance to rebuild the engine. I would replace it.

The cylinder head at cylinder 4 does not look good. I would replace the head if you decide to rebuild the engine.

 

Cylinder 4 did not look good on your dowel test earlier. Plus I have never seen a piston so steam cleaned. Must have been leaking for quite some time.

Make sure it's jdm and not a US salvage. I would also want a guarantee of 30-90 days at least. Some shops will guarantee the labor as well.

 

JDM, based on what I see so far.....
Looks like you will be able to install it yourself.

 

A GOOD machine shop can repair the missing parts of the head.
Then machine straight. But, you can only remove a very small amount of material.
Are you 100% certain the straight edge is straight? Looks like something for marking wood.
I just can’t think of the name right now.

 

Good install details
JDM Engine in a US Prius? | PriusChat

Look for X2ZR-W20 on the engine instead of the US engine’s X2ZR-W25. The injectors should be tan rather than blue.

 

I’m shocked people are still buying these money pit turd gen.