So - when I tried to find out why I had 12V at the blue sensor with ECU unconnected - I realised the misstake!
G62 (as well G6) is the sensor below the blue SWITCH!
Correct part number for the temp sensor for ECU:
And correct part nuber for the thermo switch for the extra coolant PUMP is:
ElsaWin mixed them up.
The rest didnt.... Etka and wiring diagram.
After changing the green temperature sensor - Hella.
No change in fault codes P0130 (electric fault in O2 sensor) and P0304 (cyl 4 missifre) - still comes up short after starting the enige.
So it wasnt the temperature sensor.