Looking at all these codes together, imo, it cannot be related to injectors/coils/plugs as it is hitting all 8 cylinders in 1 go. I would say this looks like a sensor that feeds information to all other sensors - Of course keep in mind that there are many answers to why would these errors all come up.
There should be another code to complement the 27BA which would also help, not sure if INPA or ISta would be a better way to read those codes - Click here to see the technical advice on it
https://www.m3post.com/forums/showpo...5&postcount=68
If I was in you shoes I would do the following to try to get my head focused more:
1- Check the oxygen sensors that you installed and the old ones- check the connection lines and ensure they are properly installed.
https://www.newtis.info/tisv2/a/en/e...sensor/OenHnRX
https://www.newtis.info/tisv2/a/en/e...sensor/Og21pSE
2- Check the fuel pressure sensor - This is the sensor on the left side in the engine bay, I have faced many e92 m3s with faulty ones which gave similar issues - I would start with the connections and move down to the actual sensor (cleaning and retrying).
https://www.newtis.info/tisv2/a/en/e...nes/1VnXgx7DaX
3- Check the MAP sensor - with the same mentality that it might be a connection issue to start with. I am leaning towards saying it might be this as It looks more like air volume issue, but not sure if it should have thrown a separate error on the sensor if it was faulty (Also try checking if the plenum is properly installed as it might also impact this, but not as severe as a map sensor)
http://www.realoem.com/bmw/enUS/show...diagId=13_1241
https://www.newtis.info/tisv2/a/en/e...l-unit/ObhgCEq
I think if you drill down that road and it is a wiring issue, it would get resolved as you would have went to the bottom of the engine.
Let us know how it goes and if you come up with any new finding.
This might end up to be a simple fix, as simple as when i got a solenoid error on bank 1 to figure out after 10 days that the camshaft sensors line on bank 1 were swapped
