Quote:
Originally Posted by Metallizer
So I've read over this DIY a few times and I'm trying to understand the significance of installing the Sonnax kit, is it an upgrade over stock? I have a 08 335i that is doing all kinds of wacky things that resulted in me having to trailer it home because it kept giving me and error code then jumping out of gear.
To me it makes sense for the solenoids to be bad along with the seal sleeves and seal adapter. From my understand the trans has never been serviced and has 160k on it.
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The Sonnex kit replaces wear components in the valve body(pistons, seals, springs, etc) My assessment is they are higher quality than stock (metal vice plastic, etc). Wrt solenoids, I just figured 150k was a good time to replace everything. If you are getting codes that narrows it down. I would research that code. Also, the Sonnex instructions include helpful notes on what part of the valve body affects a specific issue. You should be able to DL the PDF and see if something in the valve body is the issue. HTH.