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

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 is not visible from the top of the engine. I found it with a flashlight and mirror. Once I found it then got under the car it was 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. That 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 had replaced the Mass Air Flow Sensor and thought I had it fixed because the car did not throw codes or SES light for nearly a month. I suspect the Mass Air Flow sensor was not up to par and I had a compound problem.

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 that could make this job easier, please let me know.

Here is a photo of the bottom of the "Tube Elbow."

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