Found cause of P0172 & P0175 DTC's

[Harley Monster]

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.