Hey I'm brand new here. Need some help!

Welcome, you have come to the right place for advice. How much oil is the car using? Be sure to check the oil at every fill up.

 

there's a search bar top right, all the pertinent forums are on the main forum page.

sometimes you're better off doing a google search and looking for priuschat threads.

 

Welcome to the forum!

Bad cats usually happen due to burning oil. There are many posts both about how to minimize burning oil issues and bad cats - use the search bar and Google and don't be afraid to post on old threads if you're having the same issue.

 

I think what you're trying to say is that too much oil has been know to cause this error code...

 

One step at a time amigo.

 

I tend to put as much info as possible into my first comment because new posters aren't very responsive. Sometimes they never post a second time. Time's a wasting... If you don't make your point quick, you're gonna lose 'em.

 

[This is my understanding, not the truth]

You have an O2 sensor before and after the Cat, to test how well it is doing and to adjust the mixture so it does well. if the Cat is bad or either sensor, then the computer uses a generic fuel/air mixture, not ideal.

In 48 states (not CA or NY) you can use an aftermarket Cat. (either weld in or custom made) This will save you $1000.

www.amazon.com/dp/B076VVPPCM
www.amazon.com/Denso-234-4623-Oxygen-Sensor/dp/B000C5WCUO

That Cat may still need welding to exhaust system at one end, owners were not impressed by the included clamp. You will need a 10mm Hex driver bit Socket for the O2 sensor.

www.amazon.com/ARES-8-inch-Treated-Sockets-Machined/dp/B07C5Z6RNR

If you were in CA or NY

Exhaust Components for 2005 Toyota Prius | Mike Erdman Toyota

A view of what you see under car

 

Perhaps; but if it’s not burning oil it would be a completely different problem. I’m pretty sure the reason new people don’t answer back quickly is because their posts have to be approved by an admin for the first 5 posts. When I started here that took like 2-3 day each.

 

Don’t wait to check that oil. The engine in this model Prius can have oil consumption problems, like 1 qt every 1000 miles or more. Car only holds 3.5 qts, plus the cat going bad could be due to oil burning.

 

I did not find a Prius video, but I did find a Toyota video.

I bet it is more crowded in a Prius.

 

I second this, very well said. Also don’t let the shop keep the catalytic converter it’s worth good money. There’s a guy here on priuschat that pays $300 for them as scrap.