Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

Hi Fellas and Gals,


I'm sure this issue came up in the past.  I have not be able to find it.  My 05 CTT CEL came up and the code is P0431 bank 2.  I did some research and found out that the code is related to these symptoms.  


The catalytic converter is no longer functioning properly

An oxygen sensor is not reading (functioning) properly

There is an exhaust leak

Have any of you had this code?  What parts triggered this? I'm thinking its the O2 sensor.   Is there a CTT DIY page how remove the O2?  Thank you.

Link to comment
Share on other sites

  • Moderators

P0430 is pretty specific.  Before assuming it is the O2 sensor, I would check the voltage curves on the sensors for that bank with the engine running.  If the voltage curves are following each other, the cat is gone.  As the cats are rather expensive, I would also clear the code(s) and see if they return before jumping into changing any parts.

  • Upvote 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.