Need help - quite a few errors

mtl

A2OC Donor
I would need a little help regarding the following errors. Orange motor light poped up and I scaned for errors. I deleted the error codes and the light does not pop up anymore. This occured once also last year and then it was ok. Should I worry?
Regarding 00818 I will just have to find time do change the evaporator sensor (if anyone has simple instructions I would appreciate). Radio should not be a problem, probably it is because I changed the chip due to volume problem. Front speakers work ok, also display (except few dead pixels) is ok.
What should be done regarding 16785 code?
New one is 65535 on few things. It looks like there is should be a problem with ECU? Can low temperatures affect this?

Fuel/Ignition (AUA - 4LV - MT/AT)
16785 - Exhaust Gas Recirculation Flow Insufficient Detected - Permanent

Brake (ABS (Anti-lock braking system) - Mark 20 IE - MT/AT)
65535 - System OK (if MIL is active, check ECU)

Instrument (Instrument - Diagnose)
01304 - Radio

AC (Climate control - Climatronic)
00818 - Evaporator temperature sensor
- Short circuit to positive or open circuit
- Permanent

Immobiliser (Immo/Instr - Diagnose)
01304 - Radio
- No communication
- Permanent

Restraints (Airbag - Airbag 5)
65535 - System OK (if MIL is active, check ECU)

Multifunction (Convenience system - Diagnose)
01317 - Combination instrument
- No communication
- Intermittent

Multifunction (Interior monitoring - Diagnose)
65535 - System OK (if MIL is active, check ECU)

Multifunction (Radio - Diagnose)
00852 - Front speaker
- Short circuit
- Intermittent

00854 - Radio display instrument panel; no communication
- No communication
- Permanent
01044 - ECU faulty coded
- No symptom
- Permanent
 
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