I have the worst luck!

[jmcgxx]

I recently paid $3994 for the rebuild of a GM version transmission.
It had thrown a P0733 code.

[Doru]

Mike, here are my thoughts - sorry if I repeat what other members suggested (I didn't read through the answers).

I noticed you have GT1, by the screenshots. Now, go into TIS and see how to replace the air bags (rear). I know I did it a few months ago. BMW is very peculiar about how to remove the air lines and how to re-install them. You said the air bags are new. So my take is that whoever changed the airbags, either over tightened the air lines (TIS mentions 4 Nm if I'm not mistaken, which is very little - and if the nut is over tightened, it might leak) and you might need to replace some parts (minor $$$), or when re-installing them, the air lines were dirty, and the smallest amount of debris will do it. So you need to open the TIS, and inspect the air connections. Inspect thoroughly #15 and #2 in this diagram



Concerning the tranny, you might need to change the ATF, but once under the car, check closely the area around the sealing sleeve (item #1 in the diagram). The original ones had orange O-rings, which were prone to leaking - mine did and I had some horrible shifting due to ATF loss over time. The new ones (OE from BMW have different O-rings - they are black and different rubber compound). Once the filter was replaced and new ATF in, I never experienced the issue since. Make sure you use OE ATF.That was a few months back. Also, I would advise in changing the transfer case oil - you have the GT1 and INPA, and it's very easy to perform the reset after the new fluid is in - did it sometime last year (very easy, but the fluid is expen$ive).

[mikes123]

Originally Posted by Doru

Mike, here are my thoughts - sorry if I repeat what other members suggested (I didn't read through the answers).

I noticed you have GT1, by the screenshots. Now, go into TIS and see how to replace the air bags (rear). I know I did it a few months ago. BMW is very peculiar about how to remove the air lines and how to re-install them. You said the air bags are new. So my take is that whoever changed the airbags, either over tightened the air lines (TIS mentions 4 Nm if I'm not mistaken, which is very little - and if the nut is over tightened, it might leak) and you might need to replace some parts (minor $$$), or when re-installing them, the air lines were dirty, and the smallest amount of debris will do it. So you need to open the TIS, and inspect the air connections. Inspect thoroughly #15 and #2 in this diagram

Bingo! I suspected this might be the issue before you mentioned it, but when you replied I went out today since it was a little warmer and checked that fitting (#15) and saw this after I sprayed it with soapy water.

image by MikeandGabby, on Flickr

It looks like the bubbles are coming from the bottom of the nut.

So will I need to just replace part #15?


Or will I need to replace the reservoir and/or line as well?