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)

02 sensor still shows bad after replacement... plz help


Recommended Posts

Hi,

I just had my 2002 tt replaced one of its pre-cat O2 sensors a few weeks ago, but the same fault occurs (engine stalled on low rpm), so the mechanic thought the newly-installed one was defective and put in another new one. After the replacement, he ran the diagnostic, it showed fine, but after a while, it showed near zero volt (where the other sensor was showing about 0.4~5v). He ruled out pressure valve and MAF as potential problems; he also checked out the signaling wires, which seemed to be fine also. Since the sensor is connected to the DME, which he thought might be the problem... It's a costly replacement that I don't want to go through. Anyone who can give me some ideas is very much appreciated...

I was told you can't just buy a used DME and make it work. Its memory needs to be wiped clean and this can only be done by Porsche... Is this true? If it becomes necessary to replace DME, that are the alternatives than buying a new one from Porsche?

Thanks guys.

D.

Link to comment
Share on other sites

Hi,

I just had my 2002 tt replaced one of its pre-cat O2 sensors a few weeks ago, but the same fault occurs (engine stalled on low rpm), so the mechanic thought the newly-installed one was defective and put in another new one. After the replacement, he ran the diagnostic, it showed fine, but after a while, it showed near zero volt (where the other sensor was showing about 0.4~5v). He ruled out pressure valve and MAF as potential problems; he also checked out the signaling wires, which seemed to be fine also. Since the sensor is connected to the DME, which he thought might be the problem... It's a costly replacement that I don't want to go through. Anyone who can give me some ideas is very much appreciated...

I was told you can't just buy a used DME and make it work. Its memory needs to be wiped clean and this can only be done by Porsche... Is this true? If it becomes necessary to replace DME, that are the alternatives than buying a new one from Porsche?

Thanks guys.

D.

firstly, what are ALL the codes that he is reading out. Please list them.

Long long before buying a new DME you should have continuity testing of the O2 connectors/wires to the DME plug.

Really it needs to be put on a PST2 or Durametric.

Lets see the codes first.

Edited by Sunnyside
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.