Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. 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)

OBD2 Codes P1123 & P1125

Recommended Posts

Maybe I should try this as a new post. My DME fault register shows P1123 and P1125 fault codes, but I DO NOT get the CEL coming on at all. The car runs fine, but I would like to find out what is wrong sooner, rather than later. The DME actual values I am reading are:

Idle Speed - 680rpm

Load Signal - 1.3ms

Mass Air Flow - 19 kg/hr

Hot film mass air flow meter - 1.31 volts

Engine Temperature - 90°C

Throttle Plate Angle - 0°

Ignition Timing - 5.3° crank

Specific Air Mass - 17.0 kg/hr

Specific Air Adaption - 3.0kg/hr

Injection Time - 2.8ms

Oil Temperature - 90°C

IATS - 27°C

ECTS - 92.3°C

Oxygen Sensing Cyls 1-3 - 0.9 to 1.0 (varying)

Oxygen Sensing Cyls 4-6 - 1.0 to 1.15 (varying)

Range cylinder 1-3 (FRA) - 1.02

Range cylinder 4-6 (FRA2) - 1.01

Range cylinder 1-3 (TRA) - -0.36

Range cylinder 4-6 (TRA2) - -0.33

O2 sensor ahead of cat conv (1-3) - 0.1 to 0.7 volts (varying)

O2 sensor ahead of cat conv (4-6) - 0.1 to 0.7 volts (varying)

Camshaft Position deviation - -3.0° crank

Rough running threshold - 8.4

Rough running - 0.0

Segment (A) - 1.0

Segment (B) - 1.0 This should be Segment B - I can't get rid of the smiley!

Learning progress, sensor wheel adaption - 0.000

Misfire detection - 0.000

Engine compartment temperature - 60.0°C

Oxygen sensor heat resistance ahead of cat conv - 3.2ohms

I have checked the fuel pressure, and it is spot on - 3.8 bar engine off, and 3.3 bar at idle. I think all the readings are within the range of nominal values in the manual, except the TRA values that are way out.

"TRA - Time Relative Adaptation; a fuel injection adaptation method used to compensate for engine/sensor changes at idle, which are short term & small affecting the AFR, e.g. intake air leaks, and which generally varies equally with +/-values under normal conditions (taken from www.systemsc.com/glossary.htm)". I don't think it is an air leak, because the idle speed and mass air flow are within limits. The MAF sensor readings also seem to be correct, and I think the FRA values being correct bear this out.

Any ideas anyone?, and BTW what is the EVAP canister purge valve mentioned in other similar posts? Sorry for the amount of data, but I thought that too much was better than too little. I'm not sure what all these readings mean - I just took them straight off the PST2.

Edited by Richard Hamilton
Link to comment
Share on other sites

  • Moderators

This has generally been expained to me several times but it just seems to go in one ear and out the other.

You can have a pending fault code but no check engine light. If the fault is detected again then the light comes on. Something like that.

The other thing is that you are in the UK and the US OBDII system is different than yours, as is your emission system. There is actually a European OBD message board but I cannot find the link.

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.