what have i gotten in to...

ok guys I just bought a 2002 prius hybrid. I drove it home it ran fine no problems just check engine light. ok I went and got my tag and stuff done today.So the wife and I took it out. we went about 2 miles it ran fine then the triangle of death came on and had loss of power. I took it to have the codes read and got these P0171 system too lean,P3190 Poor engine power,p0340 cylinder 4 miss fire,i figure ok it has 215,000mi ao I need to replace the plugs and check the coil pack.. It still had the 1/2 tank of gas from the p/o( told me it has been sitting for about a month) so I filled it with fresh gas and it started running like its suppose to.took it out on the interstate ran it up to about 90 and run fine. then all the lights came on again but it run ok. SO now its home I got to looking and it had the wrong battery in it and wasn't in the holder. so I removed the cables and the safety latch on the drive battery. I hooked the battery back up and all I got was the drive battery no ICE. I limped it back home and now it tries to run after I reset the computer by pulling the wires off the connector at the battery.the check engine light comes back on the car fault warning comes on, I go to crank it it runs fine for about 30 sec and dies and that's all I can get out of it. So what do I do now.The ICE isn't starting just the Electrics trying to start.i haven't got to read the codes or get a volt meter to check the battery. I bought this for my daughter for college but no way I can let her have it with the way its acting...

 

and throwed a C1259 HV system regenerative malfunction code also

 

Actually the drive battery is in the trunk along with the aux battery,anyway i believe the misfire is because of a cracked coil. I put another battery in from another car i had and the ICE started and ran for about 2 min and then it died again. Maybe its not letting the engine run becuase of the fault. But it still doesnt explain why it wont start after i unhooked the battery yesterday.

 

I just used a cheap code reader to read those codes.i didnt think of running the ac to keep the engine running ill try that.now this is whats its doing, i let it set all day yesterday and started messing with it last night, the first time instarted it it ran exactly like it is suposed to. I ran up and down my road a few times and it was fine. I cut it off and restarted it, it was on all battery and then it went back into limp mode.the traction battery is at about 75 percent charge. When i stop it quits pulling going forward but has reverse. I can let it sit for a few minutes and unplug the power cable from the aux battery and it runs fine then it throws the main car problem light and shuts down

 

I havent had time to really try to figure out whats up with it prob be monday before i can really get into it

 

I have been watching the hv battery voltage level through the display. So far ive got it running long enough to keep the battery charged. Im not letting that thing die lol

 

I also been watching the aux battery voltage through the nav display it stays between 12.7 and 12.6 volts with nothing on and drops about 11.7 with the headlights and brakelights on

 

That was before i pulled the battery out of my tahoe. Just so happens its not too much bigger than the one thats in it. I was thinking maybe low voltage could have been the problem.but it did crank and run after i switched batteries though it had 12.7 volts with the tahoe battey

 

I would like to be able to use my laptop as a diagnostic too but cant spend an arm and leg what do you guys recommend

 

https://www.amazon.com/gp/aw/d/B07BCNPDDG/ref=ox_sc_act_image_1?smid=A2YFI7VOL2O69W&psc=1


Something like this?

 

Ok i checked the codes and got a p9131 and a p3190 codes,so im gonna try cleaning the maf and tbody and see what happens