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)

Replacing O2 after cat sensors on a 2001 996 c2

Recommended Posts

Check out post #49 of the following thread:


You can buy those o2 post-cats on Amazon for around $100 each (OEM Bosch). You will need an o2 sensor wrench (or a 22mm open faced wrench if I recall which I found to be a lot better). Replacement is pretty easy. Take off the air filter housing in the engine compartment to access where these plug into the computer. You should be able to unscrew them from the cat from the engine compartment, if I recall (I think I did the pre-cats from underneath the car if I remember). The only tricky part is you have to feel and can't really see from doing it from above in the engine compartment.

Conceptually you will find it's a very simple job. The hardest part is there's not a lot of room to work in there and the post cat is sitting on top of the cat's drum which makes it a little ways up there in the exhaust.

Post back and let us know how it goes.

Edited by Silver_TT
Link to comment
Share on other sites

This was an easy job. This took an hour to complete and that included a trip to Autozone to get the special O2 Sensor wrench. The dealer wanted $900+ to do and they quoted 3 hrs to complete. It was tight and getting things to line up blind was a bit of a challenge. Any way after a quick 10 mile run with no CEL, I stopped at the Ferrari store where there are 2 F40's, 1 F50 ($1 mil) and an Enzo ($2 mil), there were of course, lesser 599's F430's and the like.

Link to comment
Share on other sites

Good job! Hope the information I pointed you to saved you some time. It is tight indeed and if it weren't for this it would be a 15 minute job tops. If you ever have to do it again I bet you can do it just half the time...... definitely not a 3 hour job to do for sure.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • 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.