Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X5 E53 (1999 - 2006)

X5 E53 (1999 - 2006)
The X5 SAV Forum

Reply
 
Thread Tools Display Modes
  #1  
Old 04-27-2015, 01:32 PM
A. Rios A. Rios is offline
Registered User
Location: Bakersfield, Ca.
 
Join Date: Mar 2015
Posts: 9
Mein Auto: 98 M3 cabrio, 06 X5 4.4i
Does anyone know how to test an o2 sensor? P0161 code present

Thank you for your attention to this matter gentlemen. I have a 2006 X5 4.4i which has 77k miles. CEL just came on & my scanner says P0161 (o2 sensor on bank 2, sensor 2). There are a number of other things which could result in the appearance of this code (faulty o2 sensor wire harness, faulty ECU, faulty fuel injectors, inappropriate fuel pressure, intake air leaks and exhaust gas leaks). I want to eliminate these other possibilities but only after I test the o2 sensor, which I understand is most often the cause of the code. I already replaced the sensor on the other bank erroneously due to some misguided information.

I've pulled the driver's side, post cat o2 sensor out. I need to make sure I am testing it correctly. My understanding is these 4 wire sensors work as follows: one wire sends info from the ECU and another sends it back. The 3rd sends voltage to the heating element and the last one is simply a ground for it. So if I'm correct, continuity should exist in a good sensor between both of the signal wires. On the Bosch sensors there are two white, a black and a gray wire. Logic would dictate that both the white wires are the signal wires. And in fact I found there was continuity between them.

The simplest way would have been to switch the sensor from bank one with bank two, but the bank two sensor wire is much longer and if I plugged the shorter bank one sensor into the bank two harness, the wire would come in contact with the exhaust. And I would most likely need to drive it for a bit in order for any erased code to reappear. I've heard you can run the vehicle without it being connected at the harness, but I'm hesitate to do this. If I can do this, what is the correct process to test the sensor? Is there a chance a sensor could have continuity between the two signal wires and still be bad? Again any help here would be greatly appreciated.
Reply With Quote
Advertisement
  #2  
Old 05-01-2015, 12:01 PM
A. Rios A. Rios is offline
Registered User
Location: Bakersfield, Ca.
 
Join Date: Mar 2015
Posts: 9
Mein Auto: 98 M3 cabrio, 06 X5 4.4i
Any advice here would go a long way. Thank you again for your attention to the matter gentlemen.
__________________
Nothing But Bimmers
Reply With Quote
  #3  
Old 05-05-2015, 02:13 PM
H F H F is online now
Officially Welcomed to the 'Fest
Location: Claremont California
 
Join Date: Mar 2010
Posts: 2,627
Mein Auto: 2005 545i
Here u go ,, hope this helps...

__________________

Last edited by H F; 05-05-2015 at 02:15 PM.
Reply With Quote
  #4  
Old 05-05-2015, 02:18 PM
A. Rios A. Rios is offline
Registered User
Location: Bakersfield, Ca.
 
Join Date: Mar 2015
Posts: 9
Mein Auto: 98 M3 cabrio, 06 X5 4.4i
I really appreciate the time you took to find this answer and post a reply. I am sincererly grateful. Thank you again.
__________________
Nothing But Bimmers
Reply With Quote
  #5  
Old 05-06-2015, 10:34 AM
H F H F is online now
Officially Welcomed to the 'Fest
Location: Claremont California
 
Join Date: Mar 2010
Posts: 2,627
Mein Auto: 2005 545i
Your welcome Sir ,, happy to help .. That's what this site is all about ...
__________________
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X5 E53 (1999 - 2006)
Today's Posts Search
Thread Tools
Display Modes

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



Forum Jump


All times are GMT -7. The time now is 09:43 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms