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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!

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Old 11-30-2012, 04:41 PM   #1
E462005
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Join Date: Oct 2012
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The infamous P0174 and P0171 problem

Changed out both lower and upper intake boot and cleaned out MAF sensor.....cleared the codes and now they are back.
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Old 11-30-2012, 08:38 PM   #2
tommy d
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You have an air leak somewhere else. Keep looking.
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Old 11-30-2012, 09:12 PM   #3
jfoj
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Suggest you read the first link below in my signature.

I think you may find a few possible solutions in this post?
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-01-2012, 01:59 AM   #4
GLOK1132
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Quote:
Originally Posted by jfoj View Post
Suggest you read the first link below in my signature.

I think you may find a few possible solutions in this post?
+1 Solved my problem with a new DISA O-ring.
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Old 12-01-2012, 08:22 PM   #5
Hamsocne
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I replaced the Disa and that P0174 code went away.
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Old 12-01-2012, 10:23 PM   #6
E462005
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I'm going to have to check on that DISA. I've taking it out before but that was several months ago o ring looked fine but I will double check
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Old 12-02-2012, 05:04 AM   #7
jfoj
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O-ring ALWAYS looks fine, but it is garbage and the fit is important.

If you remove the DISA and the first 1/4" of movement offers no resistance, the DISA basically falls out, you need to replace the O-ring. Also note there are other problems that the DISA can have as well as MANY other places for vacuum leaks to occur.

Even if the DISA O-ring solves or improves your problem, likely you have other problems with the SAP vacuum lines, CCV lines, intake boots and crankcase leaks.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-02-2012, 10:29 AM   #8
Orchazum
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Oh the frustrations , be sure to read jfoj threads , very good write up.just hope your not in my situation
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Old 12-03-2012, 07:44 AM   #9
loangolfer
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Long time reader first time writer. Thanks to all that participate in this forum. You guys are great! Got my wife a 2001 330xi in '09 been replacing & fixing ever since.Just finished the PVC /cold weather update. What a bear! It took 4 dip stick tubes & 4.5 weeks in the garage because the M54 in the XI is somehow different from the other 3.0's. I ended up cutting a notch in the tube (11 43 7 531 258) where the original had pressed in dimples. Now the P0171 P0174 codes came up. Based on the wretched condition of the tubes I took out for the PVC thing the DISA sounds like the next update I will do. Bavauto gets $209.95 for a new one, but I found a kit so I will try that as it's ($75-80) cheaper! BTW.... no I will not be trading this baby in as the wife LOVES it, so I will be checking here for info for my next Bimmer fix.
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Old 12-03-2012, 07:46 AM   #10
loangolfer
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Sorry guys here is link for the DISA repair kit.
http://www.germanautosolutions.com/b...repair_kit.php
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Old 12-03-2012, 07:59 AM   #11
SeanC
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Originally Posted by loangolfer View Post
Sorry guys here is link for the DISA repair kit.
http://www.germanautosolutions.com/b...repair_kit.php
We all know about this kit. It won't solve your DISA problem 100% if the problem is with the diaphragm inside the DISA. The kit is good for the problems with the flap. A new DISA is $173 from thebmwpartstore.com.
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Old 12-03-2012, 08:07 AM   #12
jfoj
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^+1 Amen, logical minds do exist!

GAS kit is not the end all solution.

If you want a solid solution, buy a replacement OEM DISA, buy 2-3 of the correct size O-rings (3/32" thickness for the 325/330) and install a new O-ring on your new DISA before you install it in the intake. The injected silicon O-ring on the original DISA is crap anyway. Put the other 2 O-rings in an envelope in your trunk or glovebox.

You will have no problems for another 8 years and if you need to replace the O-ring in the next 8 years, you have them in stock and it will only take you 30 seconds once the DISA is removed again.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 12-03-2012 at 08:08 AM.
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