Gen 3 dies, I get check engine and triangle,

how many miles on her?

you might need tech stream diagnostic software.

 

Fuel pump? Something in the fuel delivery system seem awry.

More details about your Prius might help us.

 

Do you know for sure that your scanner pics up hybrid codes?
If not get an elm 327 Bluetooth obdii adaptor, Android phone/tablet and the torque pro app.

Would be helpful to see hybrid battery data live.

 

agree, something along the lines of fuel delivery. could be fuel injectors because there's an imbalance of mixture throwing throwing those codes. after replace MAF, sparks, filter, that narrows down to fuel related.

 

All codes aside from P0420 have been noted with turd gen with fuel pump issues reported here on PC. If I were shotgunning parts my next move would be fuel pump, holding off on the A/F sensor since the lean code (P0171) would likely resolve with restored fuel pressure, as would the MAF and 3190 codes. I would test fuel pressure before shotgunning the pump, a bit of a pain as you have to T into the fuel line on these things. There is no schraeder style test valve in the line.

P0420 is the outlier, but it may not be beyond the realm of possibility that resolving the P0171 would solve it, too. There have been reports of A/F sensor issues leading to false P0420. But generally with the Prius (and Toyota in general), P0420 points at an actual cat efficiency issue.

Rule out a fuel pressure issue before throwing any more unnecessary parts... Also, be sure these parts are oem as Toyotas generally don't play well with aftermarket electrics. Is the car an oil burner? Miles?..

 

Before I found the bent valve on my repaired head, I was getting a mass air flow code and a lean code. But I was also getting cylinder 1 misfire code. I wonder if maybe you are getting some blow back into the intake from a head gasket leak? Or maybe a burned valve?

 

The hose that is off is the PCV valve hose.

Any work done to that section of your Prius before?

 

The other hose that was off is to the vacuum system that ties in at the base of the intake manifold.

Some questions:

• How long have you owned your Prius?
• How many miles have you put on it?
• No damage or maintenance work done to the intake system during your ownership?
• Is the shop a hybrid knowledgeable shop?
• What code reader are they using?

Good luck and keep us posted .

 

Enough blow back to blow off the PCV and intake VSV hoses simultaneously? If so, that could be a logical explanation to a seemingly bizarre set of symptoms thus far. If the PCV hose blew off suddenly while driving, that would shut the car down - game over.

OP, when the PCV hose (the larger of the 2 you've pictured) is disconnected, the car won't (or shouldn't) drive any amount of miles. It won't start, although the hybrid system will spin the engine normally for a few seconds, before shutting down and setting P0A0F - "engine failed to start" along with the "check hybrid" display. P0A0F is a hybrid ecu code. If your Actron is not hybrid aware, that would explain the engine ecu code P3191 (engine does not start) but no P0A0F. The PCV and intake VSV hoses off would certainly trigger pending P0171. Are you saying you have been getting the car to drive 2-10 mile trips while those hoses were unhooked?.. Regardless, why both those hoses were off seems to be the question that needs to be answered, imo...

 

And regarding lack of hv battery charge/discharge arrows, check your 12v compartment and be sure the ambient temp sensor is connected to it's wiring harness. It's the black, plastic sensor mounted onto the metal bracket which holds the 12v battery in place. Although a shot in the dark, there are threads here claiming this sensor unplugged kills the arrow display of the hv battery...

https://priuschat.com/attachments/img_1980_md-jpg.45340/?temp_hash=3f38cd2b44f8902438a41a0952f59b30

https://priuschat.com/proxy.php?image=http%3A%2F%2Fpriuschat.com%2Fattachments%2Fa215211-png.34680%2F&hash=e020b3960bd555fbafdb3c575aa8ca98

 

Where in Illinois are you located? If near the Wisconsin line, @ericbecky is in Madison and had a shop.

While Snap On makes good tools, Techstream is the one technology that can read the check Hybrid system codes your Prius is displaying.

Good luck and keep us posted .

 

EVAP purge valve stuck open!!!