Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, WERE due Dec 4th, 2022. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

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)

OBD II codes P0410 and P1411 AGAIN!

Recommended Posts

Back to the experts again. I bought a 2001 C2 in February. It runs beautifully well.

About 1 month afterwards the CEL goes on and I take it to a well known independent in Toronto whose diagnostics show the above codes. He fiddles under the rear hood and states that a vacuum hose has become disconnected which he puts back to normal, removes the codes and resets the engine. No charge. CEL is off for about 100 miles and then reappears. It's now time for me to look myself. A connecter tube is broken leading from the electrical change-over valve to the air change-over valve. Something that is easy to fix and replace myself. I go back to him to survey the repair and reset the codes to normal. He finds all is well. No charge. 100 miles later on goes the CEL. Frustration. Back again to the expert who now thinks it is the combination air change-over valve /non return valve (2001 and after). $350 total which I thought was reasonable.

Now I purchase a Durometric Diagnostic Tool for myself. 100 miles later the CEL is on again.

Same codes. Here's what I now do. Check one way valve to the air intake system - OK. Check all accessible vacuum lines by accessing them with tubing through which I blow and suck - OK. Remove the electric change over valve and read the voltage in the harness with the SAI pump on and then with the electric change over valve on itself - 8 not 12 volts (the meter is correct). Replace the electric change over valve with a new original part.

The CEL has been reset and I await with trepidation the day that it reappears. Then what?? Should the voltage at the electric valve be 8 volts or 12 as suggested in one article that I read? I don't want to believe that the inlets into the cylinder heads are blocked with carbon deposits. I think that may be unlikely for both banks at the same time and the codes indicate that both banks are involved.

I would appreciate any advice. Of course with the replacement valve the CEL may not come on again. The above may be informative for anyone that has these codes appear for the first time.

Mel Goldberg


Link to comment
Share on other sites

It will be interesting to see what someone else says. Why do you not want to believe the cylinder head ports are clogged? How many miles do you have? Mine have to be (I figure after 122,000 miles), the Secondary Air Injection CEL pops up all the time and I carry an inexpensive OBDII reader in the console, read the codes (always the same), erase and forget about it. The SAI system is so the car can pass emission testing at startup, and doesn't do anything but pump air into the engine exhaust mix to fool the testing equipment with a diluted mix. I figure my routine is to read/delete the codes when they pop up until one day I have to pull the engine, fix all kinds of stuff and probably tackle this minor issue at that time. Some people have even (gasp!!) removed the bulb from the CEL to stop the annoyance regarding SAI CEL's all the time. Not me...but just saying...

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.