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I don't know how long the battery in my Fabia Mk4's key-fob will last, but this Octavia-related forum discussion is worth reading.   https://www.briskoda.net/forums/topic/504061-replace-key-battery-warning/   If you are confident that your battery-testing equipment is 100% accurate and your key-fob's battery is genuinely fully charged (which I would have thought would not be the case after 18 months) it may just be a one-off bloody-minded glitch in your car's electronics. All you can really do is not change the fob's battery and see if the message comes up again.   The car that preceded my Fabia was a 2021 Hyundai i20 SE MHEV. One afternoon, while I was cleaning the car and hosing it down, I noticed water running down the inside of one of the rear windows and, when I checked, the window was open by about a centimetre. I thought that perhaps, when I had moved the car, I had accidentally touched the switch that operated that window, so (cursing my luck) I mopped out the water that had got in, shut the window, finished cleaning the car, locked it and made absolutely certain that all the windows were properly closed. Next morning, when I went out to the car (parked in the open outside my house) the same window was again open by a centimetre and (surprise, surprise! it had rained heavily overnight - more mopping out! As a temporary 'fix' before I involved a Hyundai dealership, I made up a sort of shroud from Gorilla tape that, if the window did open itself again and it rained, would at least stop the rainwater getting in. Days turned into weeks and weeks into months, but the spontaneous window-opening never happened again.   (My Skoda Roomster was bought new by us in 2009. Although I keep a new key-fob battery in the glove-box just in case, I think I've only replaced the fob battery once (perhaps twice) during that 15 years period. Having had unhappy experiences with 'big brand' products (that might have been fakes) for this type of battery I normally buy inexpensive Eunicell batteries via ebay.)

Do you mean the loopy one, labelled output hose here:  

I can not believe that VW Group are so far getting away with the failures in other world regions. Maybe in Australia or New Zealand there will be a court or government agency that tears them a new one. Maybe in the USA or Canada.  

Not sure, it was a long time ago... 

Bump for @Warrior193