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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 10-11-2014, 04:55 PM
Jat007 Jat007 is offline
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Mein Auto: 325i
P0174 & P0171 Code - Help!

Hi guys,

My 2004 X3 2.5 just popped the service engine soon on display. I pulled the code and the codes are P0174 & P0171 code. From what I read, it mostly for E46, not X3. The engine idle perfect without any miss at all. About 2 weeks ago, I replaced the spark plugs. I used NGK and recommended plugs from most enthusiast on this site. The original plugs were Bosch and stamped with BMW on it. I did not have any codes after I replaced the plugs. The X3 has 83K original miles. Could this be the intake boot perhaps?

Any feedback and recommendations would be grateful.

Thank you in advance.

Jay
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  #2  
Old 10-11-2014, 05:26 PM
Supercourse Supercourse is offline
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Mein Auto: 2004 X3 2.5i
Just as much an E83 problem as an E46 one.

Likely incidental to the spark plug replacement - unless the crankcase vent valve (CVV) tubing that goes into the valve cover got damaged in the process.

Torn intake boot is a possibility, even at low 83k miles, but can't rule out the whole CVV.

See this recent post for an exhaustive discussion on that pesky code combination: http://www.bimmerfest.com/forums/sho...d.php?t=796777
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  #3  
Old 10-11-2014, 10:31 PM
Jat007 Jat007 is offline
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Supercourse - Do you have any pictures of the CVV tubing that goes in the crankcase vent valve look like? I was very careful with the whole process when swapping out the spark plugs... I have done numerous times on the E36 and E46 prior to the E83.

I will try to google around if I can find the CCV tubing.

Thanks!!

Jay
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  #4  
Old 10-12-2014, 07:16 AM
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legalfee legalfee is offline
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Mein Auto: 2004 X3 2.5i 5AT
I would suspect a torn intake boot. Also clean your maf sensor.
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  #5  
Old 10-12-2014, 08:43 AM
Supercourse Supercourse is offline
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The vent pipe into the valve cover is probably O.K. but worth checking.
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  #6  
Old 10-15-2014, 12:58 PM
Jat007 Jat007 is offline
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Thanks guys!! I checked it over and cleaned the MAF sensor, reset the CEL and so far, I haven't seen the codes yet.

Have a great day!!
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