Help with P3191 and battery recommendation?

Yup, those are the correct ones. P3191 in a gen 1 means that the engine has been cranking at the right RPM for more than the allowable time (based on the coolant temperature) without starting (i.e., without producing power to turn itself instead of being cranked).

The code doesn't tell you why it cranked so long without starting. That's old-school gasoline engine diagnosis. Good compression, the right fuel mixture, good spark at the right time, those are the necessary ingredients. Any of them being off can be a problem.

 

Do s search for P3191 and P3006 as a first step.

P3131 calls for a MAF sensor cleaning, a fairly straightforward DIY job. I removed the MAF sensor from my '02 and spritzed it thoroughly with MAF cleaner (CRC Mass Air Flow Sensor Cleaner); let it dry and re-install. This cleared up the P3191 for me. You can also inspect the throttle body for that little oil puddle down in the throat below the butterfly valve; sop that up with a rag securely tied to a stick.

Exercise due care handling the MAF sensor. It's an expensive part, so don't go poking around any orifices, but it is important to spray every accessible nook and cranny.

If the oil level is above the full mark, drain out a pint. If overfilled, then hopefully it didn't contaminate the pollution control apparatus. When I do my own oil changes, which is always, I never use more than 3.5 quarts, and a new filter.

The P3006 indicates a problem with the HV battery. Since you say you don't drive the car much, the HV may just need to be charged up to spec. State-of-charge (SOC) on the HV battery in this vehicle is 60-80%, IIRC. I'd drive the car for about 50 miles, which should take care of charging both the 12V and the HV batteries. I wouldn't invest in a new 12V just yet. 11.8 volts is sufficient to boot the hybrid system, and start the car (which, of course, is done by the HV battery, not the 12V). The AutoZone test may or may not mean anything, as it undoubtedly assumes that the 12V actually cranks the starter motor.

This isn't to say that your '02 might not need more work, as ChapmanF noted above. But heck, 80K miles is practically a new car! I'd try these simple "fixes" before sinking $$ into your nice car!

 

I dun᠎no about that puddle of oil there, every Prius has it, it's the badge of Miller-cycle Priusdom. If you sop it up you've simply made room for a new puddle of oil. If it interfered with the engine starting, Prii would all be paperweights.

 

True enough. I don't bother with mine any more, although early on I did attempt to wick it up. It's awkward to access because of that spring-loaded butterfly, and, as you imply, probably not worth the effort.

 

In re: the P3191, this thread might be helpful. See especially the comments after the video.

P3191 Code, Mass Airflow Sensor Replacement | Toyota Prius Forum

I didn't remove the air filter box like in the video, as it's possible to remove the MAF sensor with a stubby Phillips-head and/or a right-angle drive P-head.

 

Looks like battery block #19 is defective (reading low), and block #1 is high!. The Greentec is out of warranty, unfortunately. Also, that throttle valve butterfly is oil-fouled.
The plot thickens.

 

Yeah, that's a lot. Let it sit level and read it cold. Below the dimple is OK.

 

Did you first wipe the dipstick before dipping it? If so, that is about ¾ quart over. If not wipe the dipstick and dip it again to see what you got.

 

I didn't mean to cause offence, it is hard to know what people know and what they don't and from experience answering questions, I don't assume anything, that is all.

 

As I (mis)understand it, somewhere under the hood there’s a canister filled with carbon particles that’s part of the pollution-control business in the car, and it can get contaminated by, among other things, overfilling the engine oil. That’s why I said “ hopefully” you don’t (yet) have a problem caused by the severe overfill shown on the dipstick. If this were my car, I’d be down under it with a wrench and a drain pan ASAP to let at least a pint out of the oil pan! After draining some, the oil level should show somewhere between the two marks on the dipstick!

 

Perfect! Keep us informed as you go forward. Good show!

 

Going to keep it now? only 80k....

i hope you called valvoline to get your money back..