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X3 E83 (2004 - 2010)
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  #1  
Old 10-18-2010, 03:14 PM
humbertob humbertob is offline
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Smile code P0599 and then codes P0171 and P0174

3 weeks ago I just got code P0599 on my '05 X3, after doing an exhaustive research over this forum and some others uot there on the internet I decided to replace the Thermostat housing and sensor and that cured the problem. Very easy jod to do by the way. Then 3-4 days later I got codes P0171 and P0174 and based on a research I decided to clean the MAF sensor and now the X3 runs without a code and as brand new ! Another happy BMW X3 owner here !
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  #2  
Old 11-07-2010, 01:48 PM
pdx-x3 pdx-x3 is offline
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Quote:
Originally Posted by humbertob View Post
3 weeks ago I just got code P0599 on my '05 X3, after doing an exhaustive research over this forum and some others uot there on the internet I decided to replace the Thermostat housing and sensor and that cured the problem. Very easy jod to do by the way. Then 3-4 days later I got codes P0171 and P0174 and based on a research I decided to clean the MAF sensor and now the X3 runs without a code and as brand new ! Another happy BMW X3 owner here !

I just had Autozone scan my wife's 2004 X3 and got P0599. Would you please let us know where you purchased the parts? Have you found any DIY instructions on the Internet?

Thanks.
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  #3  
Old 11-08-2010, 10:01 AM
humbertob humbertob is offline
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Post

Quote:
Originally Posted by pdx-x3 View Post
I just had Autozone scan my wife's 2004 X3 and got P0599. Would you please let us know where you purchased the parts? Have you found any DIY instructions on the Internet?

Thanks.
Just ordered all the parts from pelicanparts.com and you don't need any DIY guide, you just need to remove the front air dam, and 4 bolts holding the thermostat housing, you can even do it without draining the radiator, just let the coolant flow when removing both hoses from the thermostat housing. You'll need almost a coolant gallon to refill the cooling system, that's it ! Good luck !
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  #4  
Old 11-08-2010, 03:42 PM
pdx-x3 pdx-x3 is offline
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Quote:
Originally Posted by humbertob View Post
Just ordered all the parts from pelicanparts.com and you don't need any DIY guide, you just need to remove the front air dam, and 4 bolts holding the thermostat housing, you can even do it without draining the radiator, just let the coolant flow when removing both hoses from the thermostat housing. You'll need almost a coolant gallon to refill the cooling system, that's it ! Good luck !
Will do. Looks like a messy job though. :-( Hope I won't get too much coolant spilled all over the place.

Did you order the Thermostat Housing Gasket too?
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  #5  
Old 11-08-2010, 03:53 PM
humbertob humbertob is offline
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you don't need a thermostat housing gasket, the housing comes ready to be installed as is ! Good Luck !
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  #6  
Old 11-09-2010, 11:54 AM
John320 John320 is offline
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Just a thought, but you might have less mess to clean up, if you drain out some of the coolant through the drain plug first.
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  #7  
Old 11-09-2010, 12:47 PM
pdx-x3 pdx-x3 is offline
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Just a thought, but you might have less mess to clean up, if you drain out some of the coolant through the drain plug first.
Great idea! I'll drain about 1 gal first.
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  #8  
Old 11-09-2010, 06:04 PM
pdx-x3 pdx-x3 is offline
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I have found an interesting pattern. It seems that the CEL light always comes on after the gas level gets low enough. After we fill up the gas, the light will turn off within a day. Of course, the light will come on again after the gas level drops to some degree. It seems that I should replace the gas cap. However, the latest code points to the thermostat. We filled up the gas yesterday and the CEL light didn't come on when I started the car this morning.

A couple of weeks ago, we did see the "top off coolant" light twice. I checked the coolant level and the level was ok. However, I topped off the coolant anyways. No coolant lights since then. Because of the coolant light incidents and the thermostat code, I would say that I should replace the thermostat. However, I still wonder how come filling the gas would clear the thermostat code.

Last edited by pdx-x3; 11-09-2010 at 06:07 PM.
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  #9  
Old 12-07-2010, 08:50 PM
pdx-x3 pdx-x3 is offline
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It took some time for me to figure out how to remove the front bumper. However, I couldn't find the thermostat. IDid I miss anything?

I took the following pictures:



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  #10  
Old 12-07-2010, 09:18 PM
John320 John320 is offline
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This is for the M54 & M56 Eng.
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  #11  
Old 01-09-2011, 03:18 PM
Frenchx3 Frenchx3 is offline
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Im curious where you got the images you posted. Do they come from an online source?
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  #12  
Old 01-09-2011, 06:01 PM
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X3emist X3emist is offline
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Probably from a bootleg TIS DVD

I have heard you can download (probably illegally) a TIS (Technical Information System) DVD via a torrent from some file sharing system.
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  #13  
Old 07-26-2011, 03:58 PM
BacPlayer BacPlayer is offline
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BMW P0170 and P0174

Hi,
I have the same problem with P Code P0171 and P0174. I would like to clean MAF sensor but I don't know how. Can you tell me the instruction to clean MAF sensor.

Thanks,

Quote:
Originally Posted by humbertob View Post
3 weeks ago I just got code P0599 on my '05 X3, after doing an exhaustive research over this forum and some others uot there on the internet I decided to replace the Thermostat housing and sensor and that cured the problem. Very easy jod to do by the way. Then 3-4 days later I got codes P0171 and P0174 and based on a research I decided to clean the MAF sensor and now the X3 runs without a code and as brand new ! Another happy BMW X3 owner here !
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  #14  
Old 07-26-2011, 04:26 PM
pdx-x3 pdx-x3 is offline
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Quote:
Originally Posted by BacPlayer View Post
Hi,
I have the same problem with P Code P0171 and P0174. I would like to clean MAF sensor but I don't know how. Can you tell me the instruction to clean MAF sensor.

Thanks,
http://www.linquist.net/motorsports/bmw/maf
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  #15  
Old 07-27-2011, 02:07 PM
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mlukas161 mlukas161 is offline
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Quote:
Originally Posted by BacPlayer View Post
Hi,
I have the same problem with P Code P0171 and P0174. I would like to clean MAF sensor but I don't know how. Can you tell me the instruction to clean MAF sensor.

Thanks,
Many times those codes can be from a cracked rubber air intake boot causing a vacuum leak.
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maf sensor, p0171, p0174, p0599, thermostat


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