Help asap, roaring engine sound after oil over fill?

I'd love to hear a sound bite of that when you say overfilled how far past the top dot or line on the dipstick were you quarter inch half inch a full inch would be a start I know over filling a two z z which has nothing to do with us here problems I didn't know the one nz which is our engine had this problem and you say you're just stringing along an 08 I've got an 09 that's pretty much imperfect condition it's the ugly gold with the terrible interior but I can't kill it I haven't had to do much nursing but a battery in it a few weeks ago but it was 20 years old

 

Maybe you could look under the car and see if you still have a catalytic converter.

If you are still having other issues with your Prius give Steve a call in Phoenix, he can do mobile services, maybe a tuneup for reasonable price.

Services — PHOENIX HYBRID BATTERIES

 

Theoretical: Overfilling the engine oil leads to a too high oil level. Then the crankshaft can reach the oil surface. The eccentric cranks hit the oil at high speed, like e.g. a man jumping into water from a height of 100 meters (or yards). This can cause physical damage to the crankshaft, connecting rods, pistons and/or their bearings.
I wonder if this is what happened. IDK. Hopefully not! Good luck!

FP4 ?

 

What were the "signs of low oil" and where was the oil on the dipstick after filling it?

 

How much did you add to it?

 

Does it sound like this?

 

How long's the dipstick, lol.

 

A few days ago I got into my Prius and was rewarded with very very loud exhaust noise. As in "no muffler or pipes at all."

A quick look underneath revealed both catalytic converters were GONE. The wires for the O2 sensor were left dangling where they had been torn off. The 2 saw cuts where the cat had been cut out were surprisingly clean and square. These thieves not only had brand new saw blades but they also demonstrated the skill to make clean square cuts in a hurry

When I reported this to my local PD they said "We are chasing the catalytic converter thieves right now but we haven't caught up with them yet." They had already received reports of more than 20 catalytic converter thefts during the past 3 days. The town I live in (east central Ilinois) is not a "big city" by any means. But these cat thieves are working everywhere these days. It isn't just a "Los Angeles thing" now.

FYI, my local muffler/exhaust system shop recommends the aftermarket 2Gen Prius Cat sold by Rock Auto under the "Walker" brand. It is about $330. I'm ordering one today and also a new O2 sensor.

I've read that cat thieves know how to ID a genuine OEM Prius cat vs. an aftermarket cat. They won't steal aftermarket units because these aren't worth anything to the people they sell to. Only original Toyota OEM cats are valuable enough to merit stealing them. So I'm hoping replacement with the aftermarket unit will save me from future cat thefts.

 

It sure sounds like your cat was stolen. Take a look underneath and you'll find out for sure.

 

Bolt and spring for catalytic converter. Attaches the cat converter to the exhaust manifold.

 

^ This.

 

Sounds like the thieves were interrupted and left your cat partially disconnected. Because damaged O2 sensor wires can short the computer it would be best not to turn this back on. Have it towed to a reliable Toyota mechanic for repairs. Definitely not whichever shop messed up the oil fill! Most likely they can put it back together, perhaps with a bit of welding. While there, have a cat shield installed.