Bad SAS should also defeat abs. Three 4x4 error is saying the x-drive is disabled. You can confirm with a hard launch on sand/gravel: no spinning of front wheels.

Will your scanner show you your steering angle live data?

Also what errors related to abs do you get when that comes on?

If ABS light comes on/off suggestsb your SAS is intermittent fault and clears some of the time.

The TC error says communication problem from what a brief search shows so i would use some deoxit gold on the connectors both sides you can try wd-40 or contact cleaner spray.

Definitely check the TCM / EGS connector in the ebox and confirm all pins and pin sockets are in place correctly.

Very recently a similar error turned out to be a pushed in pin socket in the ebox.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)