Gen 2 Prius (2003-2009) catalytic converter install. 

Clint, You saved me! Or should I say you saved my daughter! She borrowed my 2005 Prius to relocate to FL from MD and a week after moving her stuff down to FL, the Catalytic Converter was stolen from her car parked right outside her Apt....with gated parking! Anyway she took it to the dealer to see why it was all of a sudden so noisy, and was told that yes, someone had cut out her catalytic converter. They quoted he $3415 to replace!! She did not have that to spend on a 2005 Prius. I came across your video, ordered the parts to be delivered to her and promptly packed up the tools you recommended and flew down to FL to install (I can fly for cheap due to her flight attendant benefits!). The install went off without a hitch and I can't think you enough!!

This was an amazing video!!! I went and got a quote to get a new catalytic converter for my prius after mine was stolen and it would have costed $2000 but I just replaced my own, thanks to this video for a $150. Thank you so much! It only took 2 hours.

Awesome video man. Unmatched attention to detail and consideration for those who want to use this video for reference.

Thank you for the Video!! I’m happy to report that the Autosaver88 catalytic assembly was exactly as advertised; it was well-packed, arrived on time and undamaged. It replaced the stolen catalytic converter on my 2008 Toyota Prius with over 180K miles. The most difficult task for me was to remove the two bolts connecting the exhaust so I had to spray them with WD-40 for about 2 hours, which was difficult to reach. Once the bolts were removed with lot of torque, I examined the bolts and gasket which are in good shape so I reused them instead of using the parts coming with the package. I was fortunately that above 2 inch of pipe were remaining in front of the resonator so I can just slide the new catalytic converter to the remaining pipe (with some grease) without much difficulties after removing the rubber hangars for resonator/pipe assembly. In this way I had more room to push the resonator/pipe backward to slide the cat pipe over the resonator pipe. I then installed the flange connecting the exhaust pipe without any problems. When all assembled the catalytic converter pipe just reaches the front of resonator and is mechanically stable even without installing the clamp. The enclosed 2 inch clamp is slightly larger than desired. So I purchased a heavy duty 1¾” clamp from Autozone for about $4, which allows me to secure the connection very tightly without any sound leaks. I purchased a new Denso O2 sensor (part# 2344623) and new set of Denso OEM sparks (part #3324) from RockAuto for total $83 since my existing spark plug had run about 100K miles and I want to reduce the burden on the after-market catalytic converter that is supposed to be less effective than the old OEM converter. The car runs nicely when all done, even feels little better as the noise from heavy acceleration of this 1.5L engine seems to be less than before. I was able to achieve 52-53 miles per gallon after driving for about 400 miles (slightly better than before) in Chicago area. There are no check engine codes after I cleared the original code(s). The catalytic converter comes with 3 years/30K miles warranty and I have mailed the warranty card back to the seller. Hopefully this will last for a while, and I will update this in few months if anything changes. I am going to install a motion detection alarm close to the catalytic converter to prevent it from happening again even the replaced catalytic converter is worth very little Update: It has been 6 months since I installed the catalytic converter ( Autosaver88 catalytic assembly) with about 10K miles driven. So far everything still works nicely without any check engine lights!! Update2: The catalytic converter had worked fine for 11 month on my car without "check engine light" on. However, after driving for about 18K miles (11 month), P0420 code started to show up with CEL on. I have reset the P0420 code (caused by TID $A9 value below the minimum value specified by manufacturer) for a dozen of times during the last 3-4 months but the frequency of P0420 code showing up increased vs time. The car seems to run fine but cannot pass the emission test.

The catalytic converter theft on my 2008 prius has brought me to this video.. thanks for sharing your experience. I chuckled when you explained the drag racing engine sound from firing it up, I remember when I turned my prius ON for first first time after theft that sound and thinking oh no!

I have not done this repair yet, but when working on my crv a few years back. To make the exhaust springs easier to deal with I compressed them in a vice and then used two zip ties to keep then that way till I got the bolts started then cut the zip ties.

one of best demonstrations of this. Lots of people saying its easy and fast and selling converters. But few of them even mention the obvious Oxygen sensor you need and none of them show the details of enstallment. Thanks a bunch, a big help.

I bought the $143 Amazon cat but the two exhaust pipes were the same diameter so I cut a slit in the end of the cat, spread it apart a little, pushed the cat pipe over the muffler pipe and assembled it with muffler putty ( probably didn't need it). I used the old bolts, they overcome any alignment problems. Great vid

It’s ppl like you sir that make videos enjoyable. No music, no extra bullshit chatting. You give us what is necessary. Well done.

Thank you so much for this video. My daughter’s CAT got stolen a week ago. Called around for quotes and received a sticker shock. $1,300 - $2,300 for replacement

I'm not particularly handy or a DIY person. These tasks take me hours because I get stuck without making progress at some points. 1) Tools: be sure to have your tools ready in advance. I needed to make multiple trips to get an extension, a hex key for the cat, and an angle grinder. 2) Mating the two pipes is no joke. The pipe that was cut by the thieves was just a little too long and I couldn't get one pipe inside the other. The file proved to be too slow. So the angle grinder worked faster. I also put some old engine oil on the pipes to make them slide more easily. 3) The spring on the bolts are no joke. I was able to put one of the bolts easily. The other one, I couldn't make the threads catch. So I used one of the old springs, since it was a little more compressed than the new one. 4) I did the job alone. I think a helper would have made things faster. 5) If you're going to spray WD-40 or liquid wrench on the cat bolts, try to do it from the front and the rear. 6) Thanks for the video! 7) Good luck to those attempting this task. If it feels daunting, get the parts and hire a mechanic to do it for you. I was quoted $150 for the labor, but there would be no warranty on the work. In hindsight, I should have let the mechanic do the job.

Thank you very much for this very informative video. I just finished repairing my prius following your video. It took me 3 hours in total as the bolts are seized had to use some blowtorch. The most difficult for me was reinstalling the two bolts with spring close to the engine, it was a pain . Thank you again !!!

You’re an angel sent to all of us who own a Gen 2 Prius 🥲 you’re video is the only one out there that is clear and well put together! Thank you so much for taking the time to do this!

I just had to replace mine that was stolen. Your video was great! It answered every question. Thank you so much

Just installed a new cat using this vid, going to get it welded soon. I went with a Walker cat and a Denso O2 sensor. thanks so much for the help!

Had my cat stolen on my Prius 2 gen... that makes your great video so useful. I can't thank you enough for it. I intend to add a larger protection plate to prevent future theft. Greetings from Belgium 🇧🇪.

Thanks so much for this video. I couldn't afford to take it to the shop now I'll do it myself. ❤❤❤

Thanks so much, I have been waiting for nice weather to do mine, and today is the day. Great instruction!!!

thank you for doing this. My car just got this done to it today. I came across this video and it gave me peace of mind.

This is exactly what you need to do if your cat was stolen and you are left with the stock resonator. The cat recommended in this video fits over the stock resonator perfectly. I bought the Walker resonator just in case I was going to need it, and just for FYI, the pipe on that is exactly the same size as the pipe on this cat, so I would have needed to widen one of the pipes, or weld on some type of coupler.

Wow- you should be a teacher! Thank you for such a well done video and for putting the list of needed tools and parts at the beginning of the video and description. Our cat was stolen while he was on the road. I'm priming the parts to him and have no doubt he'll be able to figure it out after he watches your video! Cheers!

Thank you, Clint. Great video. Straight to the point and shows all of the ins and outs. Much appreciated.

Thank you for showing all of the details of the replacement, it made my install much easier.

Thanks Clint! We live in AZ also and someone just took my wife's CAT off her 07 Prius. I ordered the same thing and will be replacing it next week, this video helped me understand what all to do!

Thank you so much for this tutorial. I now know why my 2nd Gen Prius sounds like a TransAm. I got some shopping to do.

Thank you sir. Mine was stolen off my car.Neighbors got video but not good image no tag. Thanks to you I will be able to drive my car again.

Thank a lot Clint your video is really well done. My catalytic converter has just been stollen this week. I couldn't believe my ears when a heard the sound that my prius made when I started it (it's not Toyota that kind of breakdown...). Moreover I saw first one of those typical screw with a spring on the pavement nearby the front wheel . Then I saw a second one. This morning I inspected underneath the car with my iPhone and a selfie stick... and then Bingo : catalytic converter disappeared and pipe cut ! Thank a lot, your video did great.

This is one of the best car repair videos I've seen in a long time!

Wow, I really appreciate this video. I just finished replacing the cat on my daughter's Prius thanks to you! Took me more than an hour, but less than two days :-) Thank you for sharing your knowledge and experience.

Thanks for taking your time to make this video, concise and hits all the points!

I really appreciate this video for the detailed walkthrough of parts and especially your sense of frustration is what I relate with. Thank you for your guidance.

"this is my first youtube video" proceeds to make a video with higher production quality and clarity than 99.99% of all content available

next victim: got it stolen 2 weeks ago. Thank you so much for sharing the information. Thank you!!!

Thank you sir, you helped a lot of us out here who don’t know much about cars. Just know that we are grateful.

Wow great job goof your a natural even a fool could do that install. And of course your detailed explanation was awesome

Great video. Thanks for sharing your experience. Got mine stolen too and I'm trying to educate myself on the process of reinstalling this part.

I very much appreciate you taking the time to make this video. Some jerks stole the cat converter out of my 2nd gen Prius this past Thursday at night. I will be replacing it myself and this video will be instrumental. Thanks again!

I got a Telya I really appreciate videos like this it’s bad enough my catalytic converter got stolen but then the assholes that I went to for installation told me $350 so you save me $350 thank you

Clint… I will have to relate to your frustration on these limited videos. I truly hope you do more. Fantastic video.

Thank you boss. Such a great video to show everything for the person who’s not mechanic. 👏👏

Hello and thank you from Mesa AZ. Really appreciate your efforts for this straight fwd easy to follow video!

Thanks very much for this!!! It saved me a lot of money and I feel much more capable. FYI, I'm in Tucson and I found a Cat at Autozone for $700 but returned it after I found one on Amazon for $130. Autozone wanted $177 for the O2 sensor but I found it for $31 on Amazon. I own a Honda Element and a Prius. Those are the two top targets and both of mine have been hit in the last six months.

damn the leather prius, truly a unicorn

Had my cat stolen from the Luxor parking garage in Vegas yesterday morning. It was a long and loud drive back to Mesa, AZ but we made it! Thanks for this video, ordering my stuff now and I’ll let you know how it goes! Update: Knocked it out this morning and all went well! Having to cut the cat they sent me to fit over the exhaust was the hardest part but all went well. I’ve not got a bit of an exhaust leak since it’s just clamped on there but it doesn’t bother me and I’ll probably just leave it that way. Thanks for the video! The whole project cost me $115!

Happened to me today while working 😞. Parts ordered.... thanks for the video!

Btw a 5/16” Allen hex will work for a 8mm. Same size. Also wrench size. Same thing as using 3/4” for a 19mm. And vice versa. Other than that, thanks for a perfect instructional video. In all respects.

Please everybody working under his/her car, use jack stands! Never never go under with just the jack holding up the car. Jack stands are probably $25 at your local discount tool store or online and will save your chest and life.

Awesome video, great job for your first time, this helped me save a bunch of money. Thanks!

Awesome video... thanks for your knowledge and links to the parts... well done!

Good tip for using extension to push bolt with spring on. I was struggle by using my fingers. Also I will try to align the catalytic converter why tighten those two bolts to make sure it's mount wraps around the donut gasket evenly.

You’re the best!! I really appreciate the video!

Thank you for posting this, some crackhead just stole mine out of my driveway. I can't believe this crap. But your video made the repair clearer.

Amazing work and simple 👍🏻👏🏻👏🏻

Appreciate the help Clint 🤝🏿😎

Explained perfectly. Thank you!!

Thank you for taking the time for making this video!!

16:55 I'd do permatex gasket sealer goop to seal that hole to prevent exhaust fumes from getting in through that O2 sensor hole as well. Somehow the seal wasn't the same after I opened it the first time so this was absolutely required.

Thanks Clint, amazing video! I replaced my stolen cat in NL for just € 280 with the parts from this video (shipping and taxes are expensive haha). Now just hoping it'll still pass emissions testing 😬

Excellent video, You got an instant thumbs up for just having everything laid out and identified, Just for that reason I knew it'd be a good video and you didn't disappoint. I'm going to sub in hopes you decided to make other videos. Thanks.

Thank you, Clint. Preciate you sir.

Thank you. You're a good man.

Like everyone said, you did a great job. Just had the same thing happen to me. I appreciate it!

Cristal clear man! Good video!! Thumbs upp

Great video ! Thanks

Still Good video Thanks!

Fantastic video, very well done! you saved me a lot of $$ they took mine too

Thank you, it was really helpful

Excellent video thank you sir you are natural.

PSA: This is not legal in California. Currently there are no CARB approved aftermarket cats for the gen 2 Prius.

Well a few things I am going to do when i change mine is . 1 make sure the exhaust on the car is smooth so the new pipe doesn't get stuck. 2 Mark at 6 o clock on the new part so that I dont have to guess where to shove them together. Maybe a drop of super glue on the donut depending how many times i have to go fetch it. Last . Face the clamp to the side so it wont catch on anything. I am changing mine before they get it.

thanks for the helpful video!

Did you use the donut that came with the Autosaver cat? I'm getting ready to change mine all out since I bought mine with a "custom" exhaust. I wound up getting from the manifold out minus the cat at the yard since they had a 50% off sale, just to be safe. Mainly, the manifold had the AF sensor that's at least not connected on mine. I haven't gotten underneath to see yet. 30 day returns also on the yard parts. I went with a Denso OEM downstream cat just to be safe. Mainly, was wondering if that aftermarket donut has improved so is OK to use as some wrote on prius chat to re-use or get new OEM Toyota. Thanks for sharing! Great video.

Thanks for sharing.

I just had my cat stolen out of my 2008 Pruis and wish I didn't live in California (another checkmark in the box for leaving the state) so I could have an aftermarket cat option (CA is the most rigid on this and you have to get the replacement from the dealer, $2,500 plus). Great video though.

I see a new RU-vid star in the making, Your a natural on camera.

Thanks Clint.

Thanks for the share.

Thanks for sharing. Specially the part where you show how to connect the O2 sensor plug. My question is this: -Do you have an periodical inspection where you're from? And if so did it pass that? I live in Europe (Portugal) and here we have a yearly inspection where the gas emissions part is quite important. Best regards and thanks again for sharing

I guess I’m joining the club they got my wife’s last night smh thanks for the video

Excellent, thank you.

I just boxed my new back in its box! I thought the second muffler was a cat too? Mine stock so there's one longer cat.not 2 smaller ones? I was ticked bad!.!! Thanks! The sec thing with the hangers STAYS! I UN BOLTED BOTH ENDS/SO /ITS OUT/EXCEPT THE MUFFLER/TAIL PIPE

Bolts are guaranteed to walk without thread locker

The people that do this should be caught and have their hands cut off the stealing that is

thank you

Where are is the link with the part numbers/ Amazon ordering info? And how long to the items take to arrive? My GF’s CC was stolen from her 2006 Prius yesterday.. we live in the SF Bay Area (SJ) and they are charging 3000 to replace.. the car is only worth about 2500 dollars 😂😢… I want to replace it for her

Question why amazon do not have delivery in my addres in los angeles

Hello, first off thank you for the informative video! However I have couple questions, how is the car driving now and does the engine light comes on? Did it cause any other issues? Thank you again!

Thanks Clint. A lot less stressed about replacing mine now that I've seen this. One question, the cat I bought does not have the insert for the O2 sensor. Anyone else experience this? What should I do?

Pipe wrench

Couldn't I use some "high temperature" silicone and the clamp to seal between the cat and exhaust?

Thanks for the video! I ordered the same cat you did. Have you had any issues since you installed it?

NICE

Hi buddy, is the donut size the same as that of at the tail flange? Mine was stolen the whole thing. I know the tail donut is Inner Dia 38mm, outer Dia 51 MM.

I ordered the stuff from Amazon (the links you gave) just a question about the 14mm and the rest of the screws. Does it come come with the package within Amazon? What's the extra tools I should get? Like names. 14mm bit or screw? Etc. Thank you for any info you can share with me on this.

Question about check engine light. Did it come off when it was stolen? Did it clear once you installed the O2 sensor or did you have to do anything special?

Great video. You nailed it. What cat did you order. Do you have a link. I don’t know which one to orderf

I had a shop replace mine, and now the P0037 code won't stay cleared. I drove it 100 miles today in various situations, turning off the car and turning it back on a few times. Is that typical?

Thanks it happened to me too I hate these robbers

Great video, and well explained! Question: Has the aftermarket Catalytic converter held up so far? any codes come up yet? My Cat was stolen today (2009 prius 200k)...very bummed out about it! Now, trying to decide to buy an aftermarket or an original converter? Thanks

Did you have to weld anything? Thank you!