Something is wrong; Big Time

That usually indicates a severe misfire.

I've never heard of the codes you got. What sort of reader? Many code readers don't know how to ask a Prius for full details, so they only give part of the story.

 

Yes, a blinking CEL is only triggered for a serious misfire. Usually ends up being due to a bad sparkplug, but there's obviously several other possibilities, especially with a Gen 3. Could be as simple as a bad plug, a vacuum leak, or the dreaded failed head gasket.

 

You need a Prius aware code reader, could be a head gasket, keep an eye on the coolant

 

You're at the right mileage for everything to be going wrong The thing to do with this model was to be out of it by 1:50 160,000 mi somewhere right around there and you would have been golden. It's just an unfortunate thing

 

Have you had it since new?

If not, what was the miles when you bought it?

EGR and Intake manifold ever cleaned?

 

7E8 and 7EA are not trouble codes. They are being reported by the scantool to tell you which ECU is reporting the trouble codes. Trouble codes are 5 digits in length for a Gen 3. For example, P0301 is the trouble code for a misfire in cylinder #1.

How long have you owned the car?

 

Sounds to me like a case of reading the wrong things off the reader's screen as the codes.

Three-hexdigit things like 7E8 or 7EA look to me like the CAN addresses of the ECUs that are reporting the codes. That's useful information to have, so a code reader that shows those is more useful than one that doesn't. (That said, I seem not to have memorized which ECUs have the addresses 7E8 and 7EA.)

But the reader should also have shown the trouble codes. Trouble codes are five characters, where the first one is always P, C, B, or U, the next one is always 0, 1, 2, or 3, and the remaining three are hexdigits. Were there some things shown that looked like that?

Edit: beaten to it by Brian1954!

 

The problem in your earlier post is that you copied down the ECU addresses it was showing you, not the codes it was showing you. We need the codes. A code is five characters in length, starts with a P, C, B, or U. The reader has gotta be showing you that, just somewhere else on the screen; that format is nothing Prius-specific.

 

Those codes mean severe misfires were recorded for cylinders 1, 3 and 4. They don't necessarily mean that those cylinders are always misfiring, but it is possible. Generally speaking you need at least two working cylinders to maintain an idle, and sometimes three.

The P3190 code means that the computer was surprised by how little power the engine is producing given current conditions.

So, really it's a technical confirmation of what we already knew from the blinking check-engine lamp: severe misfires.

It doesn't tell us any more about the root cause. Still have to go back to the basics for that: fuel, air & spark.

Given the sudden onset, I'd probably be looking for an air leak/hose popped off, maybe a broken ground strap on the head... something like that.

Either way it's going to take detective work.

 

It could also mean a bad tank of gas/water in the gas.

 

"Manufacturer Control" is what the scan tool says 'because it's a P3 code?

Strictly speaking, I think the P0 and P2 codes are SAE standardized, P1 codes are manufacturer defined, and P3s are "jointly" defined.



I have no idea how "jointly defined" was meant to work out in practice ....

Yeah, in a Prius that specific "jointly defined" code turns out to mean that.