Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 10-02-2019, 06:58 AM   #1
Registered User
 
Join Date: Aug 2019
Location: Mi
Posts: 57
P0430 Failed Cat - Confirmed?

History for those who haven’t seen my other posts: Car had overheating problem when I bought it which I fixed with a new water pump. Also, had check engine light with lean condition codes which was fixed with a MAF sensor and also secondary issue of the AOS boot having a massive vacuum leak.

Now everything is running great but getting a P0430 code for bank 2 cat. Any idea what exactly might have ruined this? I didn’t think lean running would do this. The AOS was replaced by previous owner, maybe they waited too long to replace it?

Does the Boxster have some kind of weakness with these cats? I see a lot of posts about cat failure. I have a Jeep Wrangler that is about the same age and more miles and the cat is looking perfect according to O2 signal is smooth as could be.

Looks to me like my bank 2 cat is shot and the bank 1 cat is not much better...

Attached Images
   
Vtx531 is offline   Reply With Quote
Old 10-02-2019, 07:02 AM   #2
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,428
The three way cats in these cars are excellent. We have had customers go 200K miles and more without problems. Many times, premature cat issues can be traced to gas quality, and/or aftermarket "tunes".
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 10-02-2019, 07:18 AM   #3
Registered User
 
Join Date: Aug 2019
Location: Mi
Posts: 57
Do you agree the cat is bad? Or is there more diagnosis I need to do with O2 sensors?

Also, I am confused now because I thought the cat that would need to be replaced is the one that is combined with the manifold. Going to buy them off another member on here today but reading another post was saying the threeway cat is the bigger one further downstream? I thought the cat that is the one closer to the muffler end is unmonitored?
Vtx531 is offline   Reply With Quote
Old 10-02-2019, 09:26 AM   #4
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,428
Quote:
Originally Posted by Vtx531 View Post
Do you agree the cat is bad? Or is there more diagnosis I need to do with O2 sensors?

Also, I am confused now because I thought the cat that would need to be replaced is the one that is combined with the manifold. Going to buy them off another member on here today but reading another post was saying the threeway cat is the bigger one further downstream? I thought the cat that is the one closer to the muffler end is unmonitored?
Sensors can be checked by testing voltage and continuity.

What year and model is the car?
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 10-02-2019, 09:40 AM   #5
Registered User
 
Join Date: Aug 2019
Location: Mi
Posts: 57
2001 boxster 2.7

I read another one of your posts saying the bolts are almost guaranteed to snap off from the exhaust header - now you’ve got me thinking I should just leave it alone and ignore the CEL
Vtx531 is offline   Reply With Quote
Old 10-02-2019, 10:52 AM   #6
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,428
Exhaust bolts that have been on these cars for years are often a pain in the butt to work with. Warming things up with a torch helps, but you need to expect some broken bolts.
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 10-02-2019, 10:52 AM   #7
Registered User
 
Join Date: Jul 2019
Location: Finland
Posts: 133
Now I got woried... I have same kind of header change ahead in a couple of weeks, but am now concerned why the bolts would almost guaranteed to snap...

Quote:
Originally Posted by Vtx531 View Post
2001 boxster 2.7

I read another one of your posts saying the bolts are almost guaranteed to snap off from the exhaust header - now you’ve got me thinking I should just leave it alone and ignore the CEL
pilot4fn is offline   Reply With Quote
Old 10-03-2019, 02:34 AM   #8
Registered User
 
Join Date: Jul 2013
Location: Bastrop, Tx
Posts: 2,451
I've always thought that driving with a weak/bad AOS leads to an early death for the cats. Penetrating lube and some heat works pretty good to loosen the bolts up. I also recommend not using an air tool to remove them. You need to take it slow so you can feel if they're not turning. Sometimes tightening the bolt before loosening helps. I've also had to go back and forth a few times.
__________________
Woody

Last edited by itsnotanova; 10-03-2019 at 02:38 AM.
itsnotanova is offline   Reply With Quote
Old 10-03-2019, 09:47 AM   #9
Registered User
 
Join Date: Jul 2019
Location: Finland
Posts: 133
PErfect. Thanks for the encouragament
I'll do the exhaust swap probably in a couple of weeks whaen time allows... Hopefully the bolts open without too much of hassle.
I have done several engines, including changing exhaust bolts but those previous ones have been steel blocks (not aluminium)e

Quote:
Originally Posted by itsnotanova View Post
I've always thought that driving with a weak/bad AOS leads to an early death for the cats. Penetrating lube and some heat works pretty good to loosen the bolts up. I also recommend not using an air tool to remove them. You need to take it slow so you can feel if they're not turning. Sometimes tightening the bolt before loosening helps. I've also had to go back and forth a few times.

__________________
Boxter 2.7 2001 Manual
pilot4fn is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:47 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page