P1297-001-Printing Error + P1093-008-Sporadic Malfunction

Hello,

My Polo with EA113 (CDL) is showing its first signs of wear and tear with just 12Tkm on the odometer.

After a few days of idling and a cold start at approximately -4°C, the engine initially exhibited very strong idling between approximately 800 and 1400 rpm. Starting was almost normal, but below 1500 rpm, there were occasional hard jolts. Even after a few minutes of driving, the idle was still unstable and continued to surge (although slightly less intensely than immediately after starting).
Eventually, when the engine was warm, all the problems seemed to disappear, and even full-throttle data logs up to the limiter looked completely normal.
Only in the FS

[code]2 error codes found:

004759 - Connection Charger-Throttle Valve
P1297 - 001 - Print Loss
Environmental conditions:
Error Status: 01100001
Error Priority: 2
Error Frequency: 1
Lost Count: 255
Odometer: 12564 km
Time: 0
Date: 2039.14.00
Time: 11:16:02
Environmental conditions:
RPM: 1445 /min
Last: 30.6 %
Speed: 31.0 km/h
Temperature: 9.0°C
Temperature: -3.0°C
Pressure: 990.0 mbar
Voltage: 14.605 V


004243 - Bank 1; Fuel Injection System 2
P1093 - 008 - Malfunction - Sporadisch
Environmental conditions:
Error Status: 00101000
Error Priority: 2
Error Frequency: 1
Lost Count: 255
Odometer: 12569 km
Time: 0
Date: 2039.14.00
Time: 11:21:23
Environmental conditions:
RPM: 1492 /min
Last: 27.0 %
Speed: 40.0 km/h
Temperature: 53.0°C
Temperature: -5.0°C
Pressure: 1000.0 mbar
Voltage: 14.732 V

The next cold start in the morning, at around -3°C, was also normal.
Does anyone here know the symptoms and possible causes?


One more thing that I don't really like:
After cold starts in winter, the engine becomes increasingly "noisily irregular" under load, meaning that one cylinder produces a soft "bop" sound when accelerating. I can hear this most clearly at low speeds between 1500 and 2000 rpm. In the low-speed operation, the noise is completely gone. As the motor temperature increases, it becomes quieter and eventually disappears completely.
The engine isn't jerking, and it's running normally otherwise, except for the previous, single incident, as seen above.
Oil consumption is present (approximately 0.2l / 1000km), but IMO, it is not yet a cause for concern.

Where could the acoustic imbalance of the cold cylinders be coming from, which, as mentioned earlier, wasn't so noticeable before? Could a connecting rod bearing or piston pin possibly be worn? Or is it more likely a compensator that returns to its original dimensions when all components reach their warm target values?

[Translating...]

Ursache:
Druckregelventil der Kurbelgehäuseentlüftung auch PCV genannt - So fängts immer an - Irgendwann laufen die garnicht mehr rund - auch nicht mehr warm.

[Translating...]

@ Blackfrosch
Damit meinst Du das bisher einmalige Ruckeln und Sägen, nehme ich an?
Oder das unrunde Kaltlaufgeräusch bei Last?

[Translating...]

Die Drehzahl-Schwankungen und die beiden Fehlereinträge.