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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 06-28-2010, 01:36 PM
Nando779 Nando779 is offline
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P0174 - System Too Lean (Bank 2)

P0174 - System Too Lean (Bank 2)

My check engine light came on today. Took it to Auto Zone and the friendly clerk said it is probably the rear upstream O2 sensor. Anyone know where this is located? Are all the O2 sensors the same part?
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Old 06-28-2010, 02:09 PM
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Bank 1 if cylinders 1-3 (front of car) and bank 2 is 4-6 the last 3 closer to the firewall.

However this may also indicate a vacuum leak or the MAF sensor needing cleaned, but these generally show errors for both 02 sensors.
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Old 06-28-2010, 02:21 PM
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Quote:
Originally Posted by P_T View Post
Bank 1 if cylinders 1-3 (front of car) and bank 2 is 4-6 the last 3 closer to the firewall.

However this may also indicate a vacuum leak or the MAF sensor needing cleaned, but these generally show errors for both 02 sensors.
+1. Auto Zone always says the 0174 is 02 sensors (and it isn't). The codes for 02 are different and while it COULD be 02 sensor related, it is likely a vacuum leak. Usually a hole in the intake boot tract.
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Old 06-28-2010, 03:04 PM
Nando779 Nando779 is offline
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Cool, I'll check out the MAF and will probably just clean it since I am there. Would you be refering to the intake elbow boot connected to the MAF Shad? The one that is one of the culprites of the whistling problem?

Thank you both.
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Old 06-28-2010, 03:33 PM
Razzman Razzman is offline
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Quote:
Originally Posted by smolck View Post
+1. Auto Zone always says the 0174 is 02 sensors (and it isn't). The codes for 02 are different and while it COULD be 02 sensor related, it is likely a vacuum leak. Usually a hole in the intake boot tract.
+1 My light recently came on and my BMW tech said it was most likley a leak if anything. I'm waiting to see if it happens again then I'm going to check for leaks. Doesn't have to be O2 sensor right away.
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Old 06-28-2010, 03:39 PM
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Originally Posted by Nando779 View Post
Would you be refering to the intake elbow boot connected to the MAF Shad? .
Yes Or the one that goes to the throttle body (there are actually 2 seperate hoses). A lot of times the tear is where the main inlet diverts into the ICV.
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Old 06-28-2010, 03:54 PM
Nando779 Nando779 is offline
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Cool thanks Shad.
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Old 06-30-2010, 01:10 PM
Nando779 Nando779 is offline
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Check engine light gone! I replaced my air filter, and cleaned the MAF sensor with some CRC MAF sensor cleaner. Actually felt some difference in the acceleration, although my air filter was pretty dirty before. Thanks guys!
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Old 07-06-2010, 12:02 PM
superzcomputer superzcomputer is offline
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Most likely it's a tear in the MAF boot, check for cracks, replace, and fixed!
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