Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

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)

Multiple Misfires Errors following Coolant Pipe Replacement


Go to solution Solved by bmats,

Recommended Posts

I have a '05 Cayenne S. I changed my coolant pipes on 10/20/13 (followed the instructions in on this site) and I changed the spark plugs around Oct 2012 (less than 10k miles ago) using NGK BKR6EGP G-Power Spark Plugs.. I'm receiving the following multiple errors:

P0205 - Fuel Injector, Cylinder 5 - Open Circuit

P0300- Misfire Detection Checksum Error

P0304- Misfire Detection, Cylinder 4 (Bank 1)

P0305- Misfire Detection, Cylinder 5 (Bank 2)

P0406- Misfire Detection, Cylinder 6 (Bank 2)

P0308- Misfire Detection, Cylinder 8 (Bank 2)

My First thought was to switch out the spark plugs again and replace the fuel injector for Cylinder 5. However, before doing that I thought I would turn to this forum for suggestions on how to troubleshoot my issues...wondering if their could be other issues as hand that would cause these multiple errors.

If you think that changing out the spark plugs is a good next step, can anyone tell me what the recommended replacements are? A Porsche Certified mechanic said to use Bosche Platinum plugs and by not using them could cause misfires. Anyone agree with this assessment?

Thank you

Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

  • Moderators

I have a '05 Cayenne S. I changed my coolant pipes on 10/20/13 (followed the instructions in on this site) and I changed the spark plugs around Oct 2012 (less than 10k miles ago) using NGK BKR6EGP G-Power Spark Plugs.. I'm receiving the following multiple errors:

P0205 - Fuel Injector, Cylinder 5 - Open Circuit

P0300- Misfire Detection Checksum Error

P0304- Misfire Detection, Cylinder 4 (Bank 1)

P0305- Misfire Detection, Cylinder 5 (Bank 2)

P0406- Misfire Detection, Cylinder 6 (Bank 2)

P0308- Misfire Detection, Cylinder 8 (Bank 2)

My First thought was to switch out the spark plugs again and replace the fuel injector for Cylinder 5. However, before doing that I thought I would turn to this forum for suggestions on how to troubleshoot my issues...wondering if their could be other issues as hand that would cause these multiple errors.

If you think that changing out the spark plugs is a good next step, can anyone tell me what the recommended replacements are? A Porsche Certified mechanic said to use Bosche Platinum plugs and by not using them could cause misfires. Anyone agree with this assessment?

Thank you

There should be no problems with the plugs you chose; but you may have disturbed or not correctly seated a wiring harness plug(s) on the engine. I would start by checking anything you moved or disconnected to make sure nothing has come loose.

Link to post
Share on other sites

Exactly my thought: either one or more electrical connections that aren't made properly or even a wire that's gone brittle and cracked during removal/installation?

I had an annoying misfire on my S6 after fitting new spark plugs and coils: turned out to be a spot of grease on the coiltube, cleaned it and no more misfire!

Link to post
Share on other sites
  • 3 months later...

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.