P3190 & P0420 - Sudden Limp Mode (P0A0F) On Freeway

Long-time forum lurker, and now have something worthwhile to query about.

2012 - Prius Two - 310k miles
Engine replaced at ~185k for standard headgasket issue
Fuel Pump Replaced at ~280k miles

Vehicle has had a sudden & intermittent check hybrid system warning light and kicked into limp mode, this has historically occurred (2-3 times) and while on the freeway, driving at freeway speeds. Only codes showing were P3190, P0420 and P0A0F. Second code is likely related to clogging cats (they are original) so my focus had been on P3190 as I thought P0A0F was a generic hybrid error code (caused by the P3190).

I've dug into things slightly, and the throttle body had some carbon buildup, but wasn't totally covered, and because this issue has occurred while under freeway drive load, this didn't seem likely to be the issue. Also checked the EGR ports inside the intake manifold, but they were unclogged and looked relatively clean as well.

Checked under oil cap for any signs of headgasket issue, and I don't appear to be using any coolant (yet), though the exhaust does potentially smell a bit rich.

After the tow, and clearing the P0A0F it starts up and drives, but there's obviously something which caused the P3190. Any suggestions for likely culprits? I wondered if it could be the Fuel Pump again, shop might have used a "budget but OEM spec" option that time... My searching on the forum corroborates my guestimate about the fuel pump being the issue, but seems surprising it would fail that quickly.

Would appreciate any guidance!

 

Thank you!

On most recent instance, fuel was filled to top (by me) that morning at the "regular" gas station we use for all our vehicles, so that aspect is likely ruled out.

Dr Prius app and a Veepeak bluetooth OBD2 code reader wouldn't give the required additional color (the degree of detail) on those codes which you mentioned, right? I presume that would require a more professional Autel level type tool?

If so, I'm effectively at the point where I either, 1) throw parts at it and hope I get lucky, or 2) get a real shop to do some diagnostic work

 

Yes, my automotive diagnostic cap has effectively reached its knowledge and experience limit with how much I've done to this point, and without additional data from a more advanced scan-tool, it seems there's not much more I can personally do other than throw parts at it and guess.

 

This attached PDF is what I was able to pull from my recently acquired Autel AP200 when the error last occurred. I'm new to this granularity of data, but beyond the higher Catalyst temp values, I didn't see anything which jumped out at me as a problem when I tried googling the dataset.

Does anything look particularly out of spec to anyone?

The original listed error codes were the only ones found in any system after the full-scan with the AP200.

 

For completions sake, and for other users in the future: ultimately I was able to get the vehicle to fail with the same two trouble codes, while on side-streets and read detailed subcodes for the P3190, which was showing subcode 204.

There are technical document pdfs attached on some posts on these forums showing the diagnostic process with the above conditions. Based on everything the vehicle was exhibiting and the fact that Fuel Pump is one of the first items to check in that diagnostic recommendation document, (and the fact the Fuel Pump was replaced by a shop nearby with a budget option a year ago) I decided to replace the Fuel Pump myself without additional testing.

I bought a genuine Denso (which is OEM brand I believe) fuel-pump and it literally took 30 minutes to replace, anybody can do this, it's quite easy, especially with youtube videos showing the process. Do not waste money on this job, the book time is just criminal.

As of today, the vehicle has traveled ~80 miles without tripping codes again, and I strongly believe this may have been the solution. After installing the fuel pump, the car also felt a bit more "peppy" so another indication that it's properly sorted. The Lesspn: Don't cheap out, get the Denso fuel pump for replacement.

Vehicle still shows the P0420 (which is either clogging/end of life CAT, or the upstream O2 sensor) I'll try replacing the O2 sensor before looking for a secondhand cat off a damaged vehicle in SoCal.

Thanks all for your assistance!