Hello, I'm new to the forum.
I have a Skoda Octavia MK3 vRS 2014 2.0 tfsi 220 Hp CXXB.
I have a problem with the cooling system of the engine, the arrow on the dashboard constantly played from 60 to 120 degrees Celsius. I made a diagnosis, you can see it below.

 

VIN: TMBJE7NE1F0053737   License Plate: 

                Address 01: Engine       Labels: 06K-907-425-V1.clb
Control Module Part Number: 5G0 906 259     HW: 06K 907 425 B
  Component and/or Version: 2.0l R4 TFSI  H13 0007
           Software Coding: 0C1D00322424010B1000
            Work Shop Code: WSC 73430 031 00104
              ASAM Dataset: EV_ECM20TFS0215G0906259 001011 (SK37)
                      VCID: EBD5A1270270AB46D11-80BE
2 Faults Found:

15472 - Engine Coolant Level Sensor/Switch 
          P2556 00 [039] - Electrical Malfunction
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 194652 km
                    Date: 2022.11.16
                    Time: 19:13:05

15462 - Control Circuit for Coolant Bypass Valve 
          P2681 00 [039] - Open Cricuit
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 194652 km
                    Date: 2022.11.16
                    Time: 19:13:01

Readiness: 1110 0001

 

Sometimes the record of the second error disappears, but after a while it reappears

 

I also recorded the live values from the temperature sensors and there is something strange there, one of the values is - 48 degrees

 

VIN: TMBJE7NE1F0053737   License Plate: 

                Address 01: Engine  (5G0 906 259 )

19:34:09
  095   Coolant temp at radiator output; unconditioned voltage 1.301 V
  096   Coolant temperature 79 °C
  097   Coolant temperature at engine outlet; specified value 78.7 °C
  098   Coolant temperature at engine outlet; unconditioned voltage 1.230 V
  099   Coolant temperature at engine start 85.5 °C
  100   Coolant temperature at radiator outlet; actual value 76.9 °C
  101   Coolant temperature at radiator output; specified value -48.0 °C
  102   Coolant temperature difference between engine and radiator 2.2 °C

 

Where could this discrepancy come from?

 

 

Sometimes the arrow stands at 60-70 degrees and suddenly drops to 0 and stays like that during movement. when this happens, the radiator fins are turned on.

Seems to be a faulty coolant sensor.

Yes, but which sensor?

Hi

I’ve got the same issue with 2014 Octavia VRS 2.0 TSI.

 

The level had dropped in the coolant reservoir after a 3hr  journey back from Wales.

 

EPD light on dash and engine limited to 4000 rpm.

 

codes were:

16988 - Insufficient Engine Cooling / Coolant Flow
POOB7 00 (2371
 

15462 - Control Circuit for Coolant Bypass Valve
P2681 00 [104] - Open Circuit
 

15472 - Engine Coolant Level Sensor/Switch
P2556 00 [039] -
Electrical Malfunction

 

I refilled the coolant tank, and cleared the codes.

 

I went for a short drive round the block and noticed the temperature gauge is showing a wide variation above 90 degrees, changing rapidly up to about 120, then back to 90 again after a few seconds.

 

Scanned fault codes again and still got:

15472 - Engine Coolant Level Sensor/Switch
P2556 00 [039] -
Electrical Malfunction

 

I’ve read about possible thermostat housing / actuator failure, but could it be a coolant level and / or temperature sensor issue and if yes, which one??

 

Thanks 

nick