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  #1  
Old 11-02-2010, 12:44 AM
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Found cause of P0172 & P0175 DTC's

This forum has helped me so much in the past I hope this post helps another X5 DYIer. I apologize in advance because I posted this find in another thread but thought a New Thread would help someone when searching.

I have found the problem causing the SES light and codes P0172 and P0175!

I had replaced the Mass Air Flow sensor and it kept the SES light out for almost a month, but then the same codes reappeared.

Information given to me on this forum said to check for vacuum leaks.

I did a more thorough visual inspection and found the corrogated section of the Y on the "Tube Elbow - Throttle Housing to Air Boot" was severely cracked on the bottom side which was not visible from the top side of the engine. I found it with a flashlight and mirror. Once I found the tears then got under the car they were plainly visible.

The part number is 13541440102M9, I ordered it from Pelican Parts for $19.50.

There never was any sound associated with this leak, at least not what my ears could hear, which may because the rips were so large.

I am impressed that the injection system was able to compensate as well as it did because the engine seemed to run fine.

I am pretty sure replacing this intake tube will fix the problem because I taped the splits off with electrical tape then put a couple tie wraps around it so the tape would not come undone. We drove the car all day yesterday, multiple stops and over 100 miles and the SES light remained off.

I get the part tomorrow FedEx ground, I am just hoping I can get to the clamps, they don't seem too accessible. If anyone has any experience changing this duct and has any ideas which could make this job easier, please let me know.

I thank this forum once again for helping keep my X5 out of the dealership.


Here is a photo of the bottom of the "Tube Elbow" with the cracks clearly visible taken from underneath the car looking up.
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Old 11-02-2010, 01:07 PM
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Good to hear that you found your problem.
I, too, have had the same problem and I also replaced that Y boot. That being said, access to it's hose clamps was not fun.
There is the big clamp at the intake and the small one on the branch that connects to the Idle control valve.

To do this, I recommend that you remove the air box and the intake hoses that come from the box.
Then, remove the recatangular black box which is called the plenum switch (I think). It has two hex head screws that secure it.
Then remove the screws that secure the idle conrol valve and pull its mounting bracket out a bit (dont remove it, just pull it to you getting it out of the way)to get better access.
Then, you can see the hose clamps. There was a problem with mine, maybe for you too. The screw heads of the clamps were facing down. That meant I had to get under the car and snake my arm through to get to the screws. I recommend using a socket to fit over the screw head and forget using a flathead screwdriver. It will simply slip off.
Once you loosen the two hose clamps, you can pull the boot off the intake. Note that the branch portion is secured to the idle control valve. And the ICV is pressed into the intake manifold by a rubber grommet. I tell you this because if you pull the branch off the ICV and pull the ICV with it, you might pop it out of the grommet. No biggie, just be aware.
Installation is the reverse
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Old 11-02-2010, 01:26 PM
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Bill...thanks for this information, this is what makes this forum work.

I am pretty good with a wrench after being an aircraft mechanic for years, but looking at this it really looked like a difficult job just getting to the clamps.

When I ordered the new Y duct from Pelican, they have Customer Reviews for their products much like Amazon and other large mail order houses. There was only 1 review for this part, but in the review whoever wrote it said it was an easy job and took him 20 minutes. It doesn't look that easy to me.

Hopefully your excellent description of the job will save me hours of time. I appreciate it very much Bill.

Is there anyone else out there who has done this job who can add to Bill's instructions? Your additional help would be greatly appreciated as I don't enjoy reinventing the wheel.
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Old 11-02-2010, 06:39 PM
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I'm a little out of the loop. What system is this apart of? Is this a part of the oil separation system?

What other symptoms did you experience? Poor running? Jerky transmission shifts? Or was it just the error codes/lights?
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Old 11-02-2010, 07:00 PM
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had this problem too ended up killing my oil separator as well
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Old 11-02-2010, 08:42 PM
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My car is a 2001 X5 3.0L.

Jordo this part is the last elbow on the intake tube just before the air duct attaches to the throttle valve. The photo is a bit confusing because I took it from under the car with the camera on telephoto and it did show the surrounding equipment, but I had to crop the photo to get the Forum to accept it.

I took a new photo for you of the new part and I am holding in the approximate orientation as you would see it when you look down on the part.

The end my hand is on attaches to the throttle valve, the other end attaches to the duct that comes from the air cleaner. The splits were on the BOTTOM of the corrogated part and they were not visible from above. This part is soft rubber not hard plastic like the rest of the duct work coming from the air cleaner if I would let go of the corrogated tube it would spring out straight.

The car was running perfectly, good idle, acceleration, etc., it was just throwing the SES light and the codes.

I am not sure what the Y that comes off of it does, it may go to the Idle Speed Valve. The splits were introducing unmetered air into the engine which would make it lean. I am guessing the injection system then read it was lean and then called for more fuel and the fueling was then out of parameter. If I am wrong about that would someone please correct me.

The end result is it was throwing both the SES light and the codes P0172 & P0175 which translates to Bank 1 & 2 Too Rich.


Here is the photo of the new part:
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Old 11-02-2010, 09:41 PM
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Quote:
Originally Posted by Jordo View Post
I'm a little out of the loop. What system is this apart of? Is this a part of the oil separation system?

What other symptoms did you experience? Poor running? Jerky transmission shifts? Or was it just the error codes/lights?
You've got the V8, so this little guy is a different tube. Either way, little vacuum leaks like this always suck to find unless you have a smoke machine or are good with spraying carb/choke cleaner and using an inspection mirror.

There is a similar tube, but it's in two pieces on the 3 series that ALWAYS tears at that little corrugated part.
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Old 11-02-2010, 09:43 PM
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You are corect Harley. Too much unmetered air was going in and the O2 sensors werent able to add enough fuel to make a correct mixture.
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Old 11-02-2010, 10:21 PM
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Thank you James and Harley, much clearer now.
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Old 11-02-2010, 10:34 PM
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Bill K...I am still a bit confused on the Codes. They translate to Bank 1 & 2 TOO RICH.

The tears in the tubing should make the system go lean.

The injection system should compensate by adding fuel.

Does the injection system add too much fuel to trip these codes OR is it because the injection system is injecting more fuel than the parameters allow and trip the code.

I can see it happening either way and I don't know which way is correct. Would someone trained explain this to me?
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