Mmm yes AGM are supposed to prevent sulphation by virtue of having glass fibre between the lead plates which prevents the build up of the crystals.
It might be worth a trip to an indy garage to see if they can stick a battery tester on it to validate what VCDS is telling you. 4Ω is high according to my tester, but thats for conventional lead-acid. Not sure what the tolerance for AGM would be.
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