E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 07-02-2008, 07:56 PM   #1
Paul325Ci
Registered User
 
Join Date: Jun 2002
Location: Springfield, VA
Posts: 50
My Ride: 2002 325Ci Silver
Send a message via ICQ to Paul325Ci
Oxygen Sensor diagnosis - lessons learned

Just wanted to share my experience here, hopefully can help someone out in the future:

At 56,000 on the odometer, my Service Engine Soon (SES) light came on, no other symptoms, car ran and started fine several times. Used the Peake tool, got the following 2 codes:

E 10 PreCat oxy sensor aging, Bank 1
E 11 AfterCat oxy sensor response time, Bank 1

Ok, easy enough, will replace sensors, see what happens... Best price I found for sensors (ordered all 4) was at BavAuto, about $350 with removal socket, replaced the 2 pre-cat ones, cleared codes, but they both came back again. At this point, decided to take the car to a new shop that just opend up down the street, since spent enough time on the pre-cats, the post-cat ones looked tough, so...

They connected their $30,000 analyzer up (sorry, forgot make), and the code read indicated malfunctioning MAF Sensor! Also, the tech pointed a vacuum leak in the rubber elbow past the MAF Sensor, next to the engine, which he said was very common, but generally would not throw a code. I allowed the shop to order and replace both parts, sure enough, codes cleared and stay cleared.

Lessons learned:

1) Check for vacuum leaks, apparently relatively common due to age and high temps under hood.
2) According to two BMW mechanics (different garages), the MAF Sensor fails more often than O2 Sensors, especially if using oil-lubricated filters (i.e. K&N, Dinnan).

Also have to give good review to German Auto Group in Springfield, VA, just opened, have the lowest labor rates around in the DC area, also do work on Saturdays, nice shop, easy to deal with
Paul325Ci is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 07-03-2008, 11:29 AM   #2
hummer
Registered User
 
Join Date: Apr 2003
Location: Haverhill, MA
Posts: 3,323
My Ride: 2001 330CI
I had similar codes when using the Peake at first following the instructions to turn the ignition on first. Later had trouble getting codes and read the trouble shooting section. Said E 10 may be an error code! Said to try plugging in first then turn on ignition. When I did this, I got table 19 and code 41 for intake cam sensor! Try this procedure and see if you get similar results.
hummer is offline   Reply With Quote
Old 07-05-2008, 10:06 AM   #3
Paul325Ci
Registered User
 
Join Date: Jun 2002
Location: Springfield, VA
Posts: 50
My Ride: 2002 325Ci Silver
Send a message via ICQ to Paul325Ci
That's excellent advice, I never assumed that I was getting an "E" - error code, since the Peake tool worked for service and oil interval resets as detailed in the instructions.

Unfortunately, the codes were reset when the MAF was replaced, but will certainly refer to the troubleshooting section of the manual next time anything pops up.
Paul325Ci is offline   Reply With Quote
Old 07-05-2008, 08:41 PM   #4
///Mechanic
Registered User
 
Join Date: Jul 2002
Location: NC
Posts: 1,078
My Ride: None currently
Quote:
Originally Posted by Paul325Ci View Post
Also, the tech pointed a vacuum leak in the rubber elbow past the MAF Sensor, next to the engine, which he said was very common, but generally would not throw a code.
Past the MAF? It sounds like you are talking about the elbow that goes to the throttle body, and the small neck that normally cracks goes to the idle valve. If he told you that normally doesn't throw codes, you need to find another shop to go to.
__________________
YOU BOUGHT A BMW, IF YOU CANT AFFORD TO MAINTAIN IT............SELL IT.
///Mechanic is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Censor is ON





All times are GMT -5. The time now is 06:58 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use