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Help replacing catalytic converter on 99?

 
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Old 11-08-2008, 03:32 PM
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Help replacing catalytic converter on 99?

This is my first post on this forum.

So my g/f drives a 99 prelude and it recently threw a CEL which was identified as error P0420 (catalyst efficiency below threshold) with no other errors. I assume it's going to need a new cat, right?

With that said, I don't know much about engines period and I definitely don't know anything about her car, but I am a big DIY'er and I have a mechanical mind so I don't have much of a problem figuring things out.

Problem is I know nothing about the cat (don't even know where it is) and I could use any help and pictures. I found the DIY section on here and the 5th gen resource guide, but couldn't find anything on replacing the cat. On her car the only thing I have replaced is spark plugs and wires.

Thanks for any help. Oh and I am just looking for a standard bolt-on part. Don't need any type of performance increase. Advance quoted me $130 for the part.
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Old 11-08-2008, 04:27 PM
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Re: Help replacing catalytic converter on 99?

Personally I dont know much about codes and such, but if you feel that the cars loud and throws smoke when you accelerate, then the cat might be shot. Its fairly easy to install a new cat. Just get one on ebay or somewhere else online or just go to your local muffler shop to get it done. You can definetly get a cat cheaper than 130 though.

Like I said go to the local muffler shop and see how much they go from there.

heres one I found btw
http://cgi.ebay.com/ebaymotors/Honda...Q5fAccessories
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Old 11-08-2008, 04:43 PM
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Re: Help replacing catalytic converter on 99?

P0420 i had that one turns out my cat was ok i had a slight oil leak and it was clogged up. What i did was unbolt it. and sprayed it down with some brake barts cleaner and the o2 senators also. I maan if ur cat is bad any way u just be wasting a buck 50 and a few mints or spend 70+ on a cat u may not need.

cat will look something like this one.
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Old 11-08-2008, 05:16 PM
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Re: Help replacing catalytic converter on 99?

She did have a pretty bad oil leak a couple of weeks ago. She just a couple courts of oil in 2 days. Got that repaired, so maybe it's residual oil that dripped down.

It does sound kind of high pitched when accelerating, like it has a crappy exhaust on it (stock) but I have never seen any smoke. So maybe not a bad cat.

yogi: Can you give me an idea on where in the engine to look? Front, back, left, right? Top, bottom? Can I see it from looking down on the engine? I thought it was part of the exhaust under the car but considering the o2 sensors are with it, it must be in the engine bay? Sorry for being such a newb on cars. Lol.

Thanks.
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Old 11-08-2008, 05:24 PM
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Re: Help replacing catalytic converter on 99?

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Originally Posted by flipz View Post

yogi: Can you give me an idea on where in the engine to look? Front, back, left, right? Top, bottom? Can I see it from looking down on the engine? I thought it was part of the exhaust under the car but considering the o2 sensors are with it, it must be in the engine bay? Sorry for being such a newb on cars. Lol.

Thanks.
The lude has O2 one is right after the down pipe and the other right after the cat. Put the car up on jack stand and pop under it. follow the exhaust pipe the 02s will be the only thing on the exhaust with wires going to them.

ill see if i can find a pic
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Old 11-08-2008, 06:50 PM
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Re: Help replacing catalytic converter on 99?

Great. Thanks for the help yogi!
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Old 12-22-2008, 02:13 PM
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Re: Help replacing catalytic converter on 99?

Hey again. So we finally took her car in and they said both of her o2 sensors are bad, and the cat is bad. So both need replaced. They quoted $1700. The parts are around $450 (at autozone, I could very likely find cheaper) and I have a DIY mentality so there is no way I'm paying that much. I just need to see if anyone can give me any better pictures or instructions on replacing the cat. Thanks.
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Old 12-22-2008, 03:13 PM
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Re: Help replacing catalytic converter on 99?

For the love of your wallet, don't pay 1700 for that. It should be 300 max.

http://www.rockauto.com/catalog/rafr...1365645k991606

First two on the list there are the o2 sensors you need, and you can use the cat that ludelove posted earlier. I'm pretty sure that Denso makes the o2 sensors that Honda uses on all their stock cars, so you won't have to worry about reliability.

Once you find the catalytic converter, just unblot it, and bolt the new one in its place. As for the o2 sensors, there will be some places where there are the sensors coming into the exhaust tubing (just looks like they screw into the tubing) and all you have to do is undo the bolt, undo the plug (square-ish about 6 inches from where it connects to the piping). The plug in / bolt in the new sensor. There should be one before the cat and one after.

It's real simple.
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Old 12-23-2008, 06:51 AM
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Re: Help replacing catalytic converter on 99?

If you have wrenches, the ability to disconnect/connect wiring harnesses, and the ability to get your car a foot off the ground, you can do it. I believe in you.
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Old 12-23-2008, 07:11 AM
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Re: Help replacing catalytic converter on 99?

ya it's ez. Cat has for bolts undo them and pop the old cat off and pop the new one back on and tightening. The o2 like OneRedLude said the Denso are good and just as ez.
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Old 12-23-2008, 09:17 AM
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Re: Help replacing catalytic converter on 99?

autozone sells the denso o2 sensors, they are 68 bucks a piece i know they prolly just quoted you the bosch which are hella expensive. i used to work there. and as far as the cat goes, check out magnaflow. you can get one of their direct bolt in cats for around 125 shipped. the complete job shouldnt take very long, just make sure you soak everything down with some pb blaster before hand.
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Old 12-23-2008, 09:24 AM
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Re: Help replacing catalytic converter on 99?

Quote:
just make sure you soak everything down with some pb blaster before hand.
Unless you like bloody, busted up knucks. Random Tech makes a good HF-Cat from what I hear also.
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Old 12-23-2008, 01:15 PM
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Re: Help replacing catalytic converter on 99?

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Originally Posted by dbd6604 View Post
Unless you like bloody, busted up knucks. Random Tech makes a good HF-Cat from what I hear also.
yeah they do, but try finding a new one for under $300
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Old 12-23-2008, 07:51 PM
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Re: Help replacing catalytic converter on 99?

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Originally Posted by dbd6604 View Post
I believe in you.
Thanks!

Thanks everyone for the info. The only problem I'm running in to right now is my jack only goes up 14". Which sounds like I lot but I swear the tires don't start lifting off the ground until like 10". It leaves me enough room to just barely scoot under, and to only put my jack stands up 1 click. I will definitely have to pick up something better to get under there enough to get work done. Although searching on Advance's site the best jack they have only does 14"... hrm.

Ok just checked and the only thing I can find that goes higher and isn't online only is from Home Depot for $50 but the minimum height is 6". So I'll have to jack it up with mine, get it on the stands, then jack it up higher with that one. Goes to 22".

I'll post back after I'm successful. :)

Last edited by flipz; 12-23-2008 at 08:10 PM.
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Old 12-23-2008, 09:04 PM
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Re: Help replacing catalytic converter on 99?

get a craftsman jack, thats what i have. good stuff.
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Old 12-23-2008, 09:08 PM
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Re: Help replacing catalytic converter on 99?

Car ramps are great just make sure you get a good set and some wheel blocks too.
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Old 12-25-2008, 02:12 PM
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Re: Help replacing catalytic converter on 99?

It seems we are in the same boat topic starter.
I will also be getting a new cat soon.
And yes I live in California.
I have a couple of questions though.
For these aftermarket cats, do they have plug ins for the 02 sensors?
Or do you simply do away with the sensors all together.
This would be troublesome as the CEL would probably come on instantaneously.
Basically I guess I'm asking if there is an aftermarket cat that works exactly like the stock one as in it passes Cali smog and works with the 02 sensors flawlessly.
If there isn't, I'll just have to go the route with a hi-flow cat, and paying someone $200 to pass smog illegally. :(
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Old 12-26-2008, 12:43 PM
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Re: Help replacing catalytic converter on 99?

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Originally Posted by flipz View Post
Hey again. So we finally took her car in and they said both of her o2 sensors are bad, and the cat is bad. So both need replaced. They quoted $1700. The parts are around $450 (at autozone, I could very likely find cheaper) and I have a DIY mentality so there is no way I'm paying that much. I just need to see if anyone can give me any better pictures or instructions on replacing the cat. Thanks.

Of course they say its bad they what your money.

I have heard good things about Denso O2 sensors, plus Magnaflow makes a nice Hi Flo Cat. But for DIY, your probably going to have to cut the bolts to the Cat, unless your lucky enough to spray them down w/ PB Blaster and let them soak and hopefully you'll be able to break the nuts free, mine are going to have to be sawed off.


Denso O2 sensor
http://www.autozone.com/selectedZip,.../selectZip.htm

Cat

http://www.hottexhaust.com/search_re...2&txtCatName=2

Last edited by Rob; 12-26-2008 at 12:48 PM.
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Old 01-15-2009, 01:53 PM
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Re: Help replacing catalytic converter on 99?

Well I spent 2 days on this and only got 1 bolt off. Unfortunately I kind of have limited range of motion due to it just being on jack stands. If I had a nice lift I could just get them cut off but I don't really have the room to move to do this. Unfortunately it looks like I'll be taking this to a mechanic.

To save on price I'll be buying the parts from Jeg's or somewhere similar and only paying them for the labor to put them in. But I definitely won't be getting them off.

The 4 bolts on the cat cover are basically just rounding off (only one of these successfully came off), and the 6 cat bolts are so rusted there is no way they will move.
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Old 01-15-2009, 03:09 PM
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Re: Help replacing catalytic converter on 99?

that sucks bro, just do like you said and take all parts you want replaced with you so you dont get charged out the behind for everything.
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Old 01-16-2009, 12:34 AM
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Re: Help replacing catalytic converter on 99?

I feel ya, i recently changed out my cat &yeah it was a bit of a pain, for heat shield cover bolts i used vise grips and beat the ones i could get to with a ball peen hammer(soaked a bunch of wd40 first), then removed the shields, used the o2 sensor socket tool, took that off, now when i attempted to removed the six flange bolts, i really got irritated, so, i aimed at just removing the forward 3 bolts that run to the header(used big ratchet&socket, tap with hammer, that worked, but the rear 3 were being assholes so then i just said 'f' it and removed my entire exhaust with a buddie, obviously now with the exhaust out i got a better angle to get the last 3 out, but do it the way you think it'll work best, good luck homie
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Old 06-14-2010, 06:28 PM
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Re: Help replacing catalytic converter on 99?

I am new to this forum (joined today) and have questions about my Prelude. My Prelude is a '98. My CEL is on. I was told that the codes were for the O2 sensor and the cat. I am poor haha. I was thinking about buying the parts and installing it myself. My problem is that I do not know much about cars and I have no idea where to start. I know where the cat is located, but I don't know the process at all of going about starting. I read the non-fouler mod post, is that something I should do? Anyways, if anyone could help me out with DETAILED explanations on how to replace the cat and both O2 sensors, that would be awesome. Pictures would be awesome too since that would give me a good idea of what I'm looking for. Thanks!
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Old 06-14-2010, 07:03 PM
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Re: Help replacing catalytic converter on 99?

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Originally Posted by dbd6604 View Post
If you have wrenches, the ability to disconnect/connect wiring harnesses, and the ability to get your car a foot off the ground, you can do it. I believe in you.
You gonna call him grasshoppa too? Hahaha


Although he is right, this isn't a very high tech procedure. The only problem I foresee is the same one I had. The bolts on that cat, both the heatsheild bolts (4) and the actual cat bolts (6) are gonna be rusted. Possibly so bad you can't get them off. In that case, when everything has failed to remove them, you gotta burn em off with an acetylene torch. That's what I gotta do, and mines an 01.

However the procedure is pretty simple. Jack up your car, put some jackstands under it. Look at the exhaust, follow the headers back. It's about a 1 1/2" metal pipe. It will lead to a piece of pipe with mesh on it, called flex pipe, then it will lead into your cat. Your cat is bigger than the pipe, with a thin metal sheild surrounding it and two things with wires attached coming out the front and back of it. Thats your cat. The things with wires are your o2 sensors. Plan on it being a pain in the ass cuz shiz will be rusty. But basically you may or may not need to take off the heatsheild [citation needed] then disconnect the o2 sensor connectors, take the sensors out, then unbolt the 6 bolts that hold the cat in. The top ones will be hard to get at. Then take off the gaskets, replace with new ones, put the new cat up and bolt it in, then screw the sensors back in and plug them back into their connectors. Once all is said and done turn the car on and if the CEL is still there pull your clock radio fuse in the fuse box under your hood for 10seconds. This will clear the CEL. ***Make sure before you pull that fuse, you know the radio code. It will not work without it and pulling the fuse will clear it. Also after you pull the fuse it resets the ecu so the car might run weird for the next 10 miles or so before the ecu relearns its shiz.

Have fun.
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Old 06-14-2010, 07:06 PM
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Re: Help replacing catalytic converter on 99?

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I am new to this forum (joined today) and have questions about my Prelude. My Prelude is a '98. My CEL is on. I was told that the codes were for the O2 sensor and the cat. I am poor haha. I was thinking about buying the parts and installing it myself. My problem is that I do not know much about cars and I have no idea where to start. I know where the cat is located, but I don't know the process at all of going about starting. I read the non-fouler mod post, is that something I should do? Anyways, if anyone could help me out with DETAILED explanations on how to replace the cat and both O2 sensors, that would be awesome. Pictures would be awesome too since that would give me a good idea of what I'm looking for. Thanks!
No. The non foulers are for test pipes. That way you can run a straight pipe where the cat should be and not set off a CEL. Your cat/o2 sensors need to be replaced. Depends on the code. Go to autozone they will tell you the code for free.
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Old 06-14-2010, 07:08 PM
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Re: Help replacing catalytic converter on 99?

Thanks for your help.
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Old 06-14-2010, 07:53 PM
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Re: Help replacing catalytic converter on 99?

So I got the codes. They are P0133 and P0420. He told me that it's for the first O2 sensor and that that's the one that needs to be replaced.
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Old 06-15-2010, 11:59 AM
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Re: Help replacing catalytic converter on 99?

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Originally Posted by Favio View Post
So I got the codes. They are P0133 and P0420. He told me that it's for the first O2 sensor and that that's the one that needs to be replaced.
OBD-II Trouble Codes - DTC Codes Car Repair



that website will tell you what all the obd2 codes are.
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Old 06-16-2010, 05:56 PM
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Re: Help replacing catalytic converter on 99?

i was in ur same shoes get a better jack or ramps spray the **** out of the 6 nuts wit pb blast let them saok for 20 mins spray em again wait 10 mins then bust out your breaker bar and make sure u use 6 point sockets 12 pt will strip the nuts trust me it happened !But i still got it offf it can b done!!
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Old 11-06-2015, 09:35 AM
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Re: Help replacing catalytic converter on 99?

Quote:
Originally Posted by Favio View Post
I am new to this forum (joined today) and have questions about my Prelude. My Prelude is a '98. My CEL is on. I was told that the codes were for the O2 sensor and the cat. I am poor haha. I was thinking about buying the parts and installing it myself. My problem is that I do not know much about cars and I have no idea where to start. I know where the cat is located, but I don't know the process at all of going about starting. I read the non-fouler mod post, is that something I should do? Anyways, if anyone could help me out with DETAILED explanations on how to replace the cat and both O2 sensors, that would be awesome. Pictures would be awesome too since that would give me a good idea of what I'm looking for. Thanks!
99 Honda Prelude SH 202,000 KMS Complete overhaul of everything including sensors and solenoids and all other parts less than 3months old
I keep it updated whether it needs it or not.
Next is New shocks and Headlights then I am done for a while!

P0420
I had this code and I believed it was the CAT or the Sensors.
I changed the both SENSORS twice once with DENSO then with BOSCH.
Still the P0420 came on.
So I put in a straight THRU pipe in with 02 Sensor and the P0420 still comes on after 40 miles!
No CAT and a STRAIGHT THRU pipe is in and still the code P0420 comes on.
Any suggestions?
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