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Hello
I realize these posts are a bit old, but it is totally relevant to the situation I have with my '06 330 Xi, so I hope you are still out there.
About 70k miles, I started having the 2-1 bump and issues with the 4-5 shift. Under load the car would occasionally go into limp mode. I changed the fluid and filter and it seemed to get better, but did return.
Now I have 105k miles and the issues have somewhat worsened, so I replaced all the solenoids, mechatronic seals, fluids and filter. I reset the adaptions with the Bavtech tool. The 4-5 gear shift seems to have gone away, but not the 1-2 bump.
Any suggestions? I did not go into the valve and replace with a Zip kit.
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