Can this red ring on the coil connector be responsible for engine code P0203 in a 2011 V70?

[Helen2023]

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Hello! I have a 2011 Volvo V70. It was giving engine code 0203 and 0303, so I replaced all spark plugs and it ran fine for one day.

Now it has a rough idle and poor acceleration, and gives engine code 0203. I read more online and saw advice about the wiring, so I inspected all coil connectors and found that the red rubber on the connector for cylinder 3 has a damaged section.

Can this be the cause of the problem?

If so, what phrase should I search for to find a replacement? I am in Sweden and the largest car parts store near me is Biltema.