Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 08-20-2017, 06:09 PM   #1
Registered User
 
Join Date: May 2016
Location: Northville, MI
Posts: 249
I'm surprised you don't get the old P0420 code with the secondary reading basically nothing. Supposedly the secondaries don't affect the air/fuel but I am speculating that they do in the long term if it sees something it doesn't like for extended periods of time. You should be steadier on the second 02 and closer to .5v but it should still bounce around the .4 to .65 range.
bwdz is offline   Reply With Quote
Old 08-20-2017, 06:46 PM   #2
Registered User
 
CrisZenithBlue's Avatar
 
Join Date: Mar 2015
Location: Miami, FL
Posts: 584
Quote:
Originally Posted by bwdz View Post
I'm surprised you don't get the old P0420 code with the secondary reading basically nothing. Supposedly the secondaries don't affect the air/fuel but I am speculating that they do in the long term if it sees something it doesn't like for extended periods of time. You should be steadier on the second 02 and closer to .5v but it should still bounce around the .4 to .65 range.
it doesnt move at all so that means its busted right?
CrisZenithBlue is offline   Reply With Quote
Old 08-21-2017, 05:17 AM   #3
Registered User
 
Join Date: May 2016
Location: Northville, MI
Posts: 249
[QUOTE=CrisZenithBlue;547491]it doesnt move at all so that means its busted right?[/QUOTE
Either the o2 is busted or wiring to it or the plug etc... You have to go drive the car and get the cat and o2 nice and warm to get accurate readings. They wander around when cold startup and then smooth out but your seems to be dead. The smoke test is great at finding vacuum leaks but you have to stick it in several places, I even throw them in the dipstick on cars to look for PCV problems on vehicles or other gasket leaks by just slightly pressurizing and filling the crankcase.
bwdz is offline   Reply With Quote
Old 08-24-2017, 06:35 PM   #4
Registered User
 
CrisZenithBlue's Avatar
 
Join Date: Mar 2015
Location: Miami, FL
Posts: 584
Quote:
Originally Posted by bwdz View Post
I'm surprised you don't get the old P0420 code with the secondary reading basically nothing. Supposedly the secondaries don't affect the air/fuel but I am speculating that they do in the long term if it sees something it doesn't like for extended periods of time. You should be steadier on the second 02 and closer to .5v but it should still bounce around the .4 to .65 range.
now that i think about it.. a few months ago i got the P0420 code, i reset and it never came back so i assumed the cat is fine. i never checked the O2 sensor though.

Last edited by CrisZenithBlue; 08-24-2017 at 06:44 PM.
CrisZenithBlue is offline   Reply With Quote
Post Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 08:12 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page