different fault codes 2005 V70 II P26

[NoJokes]

Hello everyone from Berlin and wishing you a happy 3rd Advent.

We have had our new Elch for almost 2 months now and have driven 2000 km without any problems. From the beginning it had a few small things that needed to be checked:
- permanently cold air in the passenger footwell
- PDC error / not working
- auxiliary heating not working
- 1 Din radio replaced with HU.
The first thing I did was get a HU-650 and installed it. It works as it should, but since then I have had an SRS system maintenance message. Since I couldn't delete it, I got a VIDA laptop with a MONGOOSE cable in England and am now a bit wiser:
No connection can be established with the HU (AUM-49FD faulty installation). I think I have to take it to the dealer so that he can "marry" the HU and the car. Curiously, a HU-850 is displayed in the vehicle overview.
The PDC shows the 2nd sensor as defective (REM-4F43), I will check the contacts there first. Because of the cold air in the passenger compartment, I reinitialized and calibrated the original CCM. All end positions were reset, but the cold air remains, as well as the errors CCM-0070 configuration error incorrect initialization and CCM-0040 air quality sensor is said to be defective. Then CEM-5F46 glow plug faulty signal. That is a job for the summer, remove the auxiliary heating and overhaul/repair it. The CEM-DD20 LIN bus 2 communication error remains for me. Attached are 2 pictures of the error log before/after.

Regards, Michael