2005 Prius Won't Start After Oil Change

How old are the spark plugs? (or can you post a picture)

Since cylinder #3 (and possibly #4 now) is not misfiring, try swapping the #3 coil with #1 and #2 cylinder to see if the misfire follows.

 

Maybe you should go after that less-than-helpful oil change place? At the least, give them a neg review and stick to DIY or dealership in future.

 

what does the mech know about hybrids?

what did he get for codes?

what is causing the problem?

what are the details of his solution?

i would want to know all this before making a decision. sounds a bit odd to me

 

We see these codes a lot here at PC. Not usually 11 of um though. I did my usual search
toyota dtc (xxxxx) and when I got to P3191 I found this link.
2001-2009 Prius P3191, P3190, P0A0F - easy checks for these common codes

If someone else has already suggested putting a float charger on your 12 volt battery, or it's (12 volt batterys) been load tested already, oh well

I know it's hard to believe a flat 12 volt could cause 11 fault codes, but ---

 

What happened when you moved/swapped the working #3 coil onto the #1 or #2 spark plug, did the misfire go away or move?

Doing the above should tell you if the coil(s) need replacing, or just some better cleaning.

What do the spark plugs look like?

The discoloration that you noticed in the #1 and #2 spark plug wells is from water intrusion, this is a known issue.

This mechanic(?) could need some help with the next boat/baby payment. Unless this was at a toyota dealership, there isn't any "software", new or old that he will find, install, or update. Basically BS. Please find another mechanic. Sure hope they didn't charge you for this advice.

To answer the question, this is not a solution and the fee isn't normal/reasonable, and this mechanic isn't qualified to work on a hybrid, etc.

Wondering if @ericbecky could offer you some hands on assistance?

 

Whether it is or not reasonable always depends, but it doesn't sound correct to me.
Besides I wouldn't want a third party shop updating the software of the prius. It's something you'd want to have done by a dealers service dept. and only if they provide you with the instructions telling them that is what your car needs.

 

It's almost common for Prius to die on the way out of a oil change shop. It's because of dust and debris getting on the MAF.

Here's a video showing how to clean a Prius MAF sensor.

At the 1:31 mark it shows two wires buried deep inside the sensor. A spec of dust on these wires will cause all the problems you are having. Simply cleaning the bulb out in the open is not enough.

Oil change shops often try to up sell an air filter replacement. When they open up the air cleaner dust can get disturbed and land on the MAF sensor. The hidden wires are in the passage on the top side of the MAF. The landing at the opening of that passage is good at catching dust that gets by the air filter.

Take the MAF out again check those wires .

 

I'm not sure if you posted a different video to the one you reference, but that is not what I was expecting to see. It didn't look at all like he even cleaned the airflow-sensing filaments. It looked like he just cleaned the outside housing.

Anyway, I agree with all you said but don't think this video illustrates the cleaning process very well.

Try the video below. Although the car is a Camry, the MAF sensor is essentially the same. The video itself is a bit labored and tedious to watch but illustrates well what is trying to be achieved. :

MAF Sensor Cleaning in Slow Motion

 

Based on the recurring misfires it’s this

Bad plugs or
Bad coil on plugs COPS or
Blown engine

I think what’s happening is you may have a bad valve cover gasket very common and is allowing oil to get into the sparkplug wells and that will foul the cops. You mentioned this on your post. My vcg failed at round 100k miles.

Pull a cop off and take a picture of the sparkplug well with your iPhone.See if there’s oil in there again. Pray there’s oil in there again.

Or there was so much oil in the car and spark plug wells it shorted out your cops. There probably the original cops which is a miracle to begin with.

it takes alot of oil to fill up the throttle body like that. This engine takes exactly 3.9 Quarts with a new filter. I have done around 35 oil changes in mine in the last 14 years.