this little sensor/switch fixed my problem . The engine now starts immediately and doesn't shut off . I can immediately select a drive position.

After I removed the sensor/switch it spilled approx. 2litre of coolant; I was a bit surprised but filled it up again and temperature is fine. Now I also own a tubular box wrench (what a stupid position this sensor/switch is at :>).

Thanks for your help.

Kind regards,
Andreas.