Any complaint made within the warranty period is valid until rectified, regardless of whether warranty has expired or not. I have seen an issue on a German car with a known problem where repairs were carried out after 6 years.
I had the software update done on my car this morning, so I will let you know after several days if it has made any difference. I was also notified that I would be receiving an updated knock sensor as soon as 1 becomes available.
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