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)

Do I need 2 new O2 sensors?!


Recommended Posts

I have a '98 Boxster 2.5 (US model) with the following CEL codes....I don't know what they mean and I'd like to go to the mechanic with a little info in my back pocket. Do I need new sensors? Thanks,

P1123 Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

P1125 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Lean Threshold

P1128 Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold

P1130 Oxygen Sensing Adaptation Area 2 (Cylinders 4 - 6) - Rich Threshold

Link to comment
Share on other sites

The pollution control circuitry consists of a sensor in the air intake (MAF) and ones in the exhaust (O2). I can't see two failures at the same time being probable so my suspicion would be something that can affect both sides of the engine. You can replace any of these parts yourself very easily. There are instructions online and parts cross references so you don't have to use Porsche branded parts but can use parts from the company that makes the parts and sells them to Porsche.

Any other symptoms beside the CEL and codes...like rough running under specific circumstances?

http://mike.focke.googlepages.com/mikespor...boxsterwebpages

Link to comment
Share on other sites

  • Admin
I have a '98 Boxster 2.5 (US model) with the following CEL codes....I don't know what they mean and I'd like to go to the mechanic with a little info in my back pocket. Do I need new sensors? Thanks,

P1123 Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

P1125 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Lean Threshold

P1128 Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold

P1130 Oxygen Sensing Adaptation Area 2 (Cylinders 4 - 6) - Rich Threshold

Are some of these old codes - and others are new codes?

It is not very likely that you would have both a too rich and too lean situation at the same time.

Link to comment
Share on other sites

Car runs fine as usual. Not sure if codes are old or new...CEL came on last summer but just getting around to it now. I've replaced 2 o2 sensors over the past 3 years so I assumed CEL was for the last 1 or 2 sensors.

Link to comment
Share on other sites

As always, thanks for your advice!

Getting the same codes my self 1123 and 1125 - had them cleared multiple times and keep coming back. 1999 Boxster 2.5.

Aurora Colorado....car runs great.

Link to comment
Share on other sites

I have a '98 Boxster 2.5 (US model) with the following CEL codes....I don't know what they mean and I'd like to go to the mechanic with a little info in my back pocket. Do I need new sensors? Thanks,

P1123 Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

P1125 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Lean Threshold

P1128 Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold

P1130 Oxygen Sensing Adaptation Area 2 (Cylinders 4 - 6) - Rich Threshold

2001 Boxster 2.7

This might help.

Got codes P1128 & P1130 today. Google search revealed that cause could be air leaks in inlet manifold after meter. Found join immediately after air filter box was loose due to corroded/broken clamp. Saved the cost of purchasing 2 oxygen sensors - although conclusion is a bit early as full flow test ;-) not carried out yet.

Link to comment
Share on other sites

It is unusual to get both rich and lean codes at the same time. I suppose it is possible if the MAF sensor is going south and giving inconsistent readings from day to day. Try simply unplugging the MAF and go for a spin. If the car runs better, replace the MAF. Cleaning the MAF works sometimes but is often a temporary fix.

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.

Guest
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.