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 > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 12-10-2012, 11:04 AM   #1
Boomer 330Cic
Registered User
 
Join Date: Dec 2012
Location: Scottsdale, AZ United States
Posts: 4
My Ride: 330Cic
Post Does on board computer have to be reset on car or does po174 still exsist?

Help please! My check engine light came on a couple of weeks back. I used my CarMD (OBD reader) diagnostic reader on my 2003 330Cic and it gave a reading of po174 (only). So I cleaned the MAF and also found a tear in the oil separator hose going to the dipstick so I replaced that hose also. The check engine light would not go out at that time (my CarMD tool does not have a reset on it) so I disconnected the battery and crossed the 2 cables to reset the check engine light and the check engine light did go out but my CarMD (OBD reader) still reads as po174. Now 2 weeks have passed and the check engine light does not come on but my wife claims that the car will sometimes studder on take offs and does not have as much power as it did before the original check engine light came on. I drove the car and it seams fine but I do not drive it all the time. My CarMD reader still shows po174. Does anyone know if this could be happening because I could not reset the computer on the car or is the po174 still the problem. (PS: I did check the CarMD reader on another vehicle and it read all systems normal without any po code.)

Last edited by Boomer 330Cic; 12-10-2012 at 11:48 AM. Reason: Rename Header
Boomer 330Cic is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 12-10-2012, 12:35 PM   #2
GhostFlame
Registered User
 
Join Date: Jun 2011
Location: oceans
Posts: 192
My Ride: LSB/HPF
CarMD is garbage. Get the bmw scanner.
__________________
GhostFlame is offline   Reply With Quote
Old 12-10-2012, 01:58 PM   #3
Boomer 330Cic
Registered User
 
Join Date: Dec 2012
Location: Scottsdale, AZ United States
Posts: 4
My Ride: 330Cic
Cool Thanks for the reply

Sorry Ghost, I am aware that there would have to be better OBD scanners out there (knowing what I know now I do not think I would have bought the CarMD) but back to my question. If the scanner still reads po174 in my case above does the problem still exsist or do I have to get it reset? Also now that you mentioned getting a BMW scanner would the BMW scanner isolate the problem to be more specific of what the actual problem is within the reading of po174?

Last edited by Boomer 330Cic; 12-10-2012 at 02:00 PM. Reason: more detailed
Boomer 330Cic is offline   Reply With Quote
Old 12-10-2012, 03:11 PM   #4
jdstrickland
Registered User
 
Join Date: Apr 2010
Location: Murrieta, CA
Posts: 6,649
My Ride: '94 325iC & '00 323i
If the scan tool you are using does not have a reset button, then you have to wait for the car to turn the light off by itself OR get a scan tool that does have a reset button. (Why anybody would buy a scan tool that cannot reset is beyond me, but what do I know?) Anyway, all systems are constantly monitored, and if you really did manage to fix something then the light should go out by itself, eventually.

P0174 means Lean, Bank2, Sensor1.

There are are sensors mounted to the exhaust manifolds in front of the CATs. Your code is the sensor on the rear manifold is reporting that the exhaust gas does not have enough fuel in it, which is the same thing as saying the exhaust gas has too much air. Cleaning the MAF does not change the symptoms you have reported, which means the light will not be going off any time soon. Indeed, if you clean the MAF poorly there is a good chance you can make the symptoms worse.

Last edited by jdstrickland; 12-10-2012 at 03:12 PM.
jdstrickland is offline   Reply With Quote
Old 12-10-2012, 04:26 PM   #5
Boomer 330Cic
Registered User
 
Join Date: Dec 2012
Location: Scottsdale, AZ United States
Posts: 4
My Ride: 330Cic
Exclamation Thank you JdStrickland - oxygen sensor

Thank you for answering my question. By sensor1 does that mean Oxygen sensor #1 could be bad or malfunctioning? bank 1 and bank 2 appear to have an oxygen sensor, if it is a bad sensor is there a way to test the sensors?
Boomer 330Cic is offline   Reply With Quote
Old 12-10-2012, 04:38 PM   #6
RayPooley
Registered User
 
Join Date: Jul 2012
Location: Liverpool
Posts: 1,432
My Ride: 320i SE Coupe
Quote:
Originally Posted by Boomer 330Cic View Post
Sorry Ghost, I am aware that there would have to be better OBD scanners out there (knowing what I know now I do not think I would have bought the CarMD) but back to my question. If the scanner still reads po174 in my case above does the problem still exsist or do I have to get it reset? Also now that you mentioned getting a BMW scanner would the BMW scanner isolate the problem to be more specific of what the actual problem is within the reading of po174?
You have to clear the fault codes after you have fixed the problem. Sometime fault codes, especvially misfire codes, can occur transiently. This doesn't necessarilly meant that there is a problem. but the faulty code will remain until you actively clear it using your scanner tool/software.
RayPooley is offline   Reply With Quote
Old 12-11-2012, 09:52 AM   #7
Boomer 330Cic
Registered User
 
Join Date: Dec 2012
Location: Scottsdale, AZ United States
Posts: 4
My Ride: 330Cic
Wink Thank you

After reading your post I did it last night. Hope thats the end of po174. Happy Hollidays
Boomer 330Cic is offline   Reply With Quote
Reply

Tags
maf, obd-2, oil separator, on board computer, po174

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 10:17 PM.


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