Hi I just wondered how much BMW quoted you for the sensors. I am in the process of looking at Winter Alloys and Tyres for my M40i. My husband just changed his 3 Series Alloys for Winters and BMW wanted over £800 for a set of new sensors.
I paid £85 for four sensors off eBay, supposedly genuine with BMW written all over them, link below
https://www.ebay.co.uk/itm/334848668996?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=xhgglatyrfy&sssrc=4429486&ssuid=vFA24A7fRJi&var=&widget_ver=artemis&media=COPY
The sensors hadn't actually failed per se, the guy at my local tyre place who replaced them said he checked them and all were transmitting. The only thing that makes sense is that as the battery voltage deteriorates I think the signal strength may also get weaker until they can't be picked up and the system crashes.
As I've just discovered, not only will they happily fail within the warranty period, but they're considered a wear item and so are chargeable. Eighty quid a pop from the dealer "after a 20% discount", but at least they're not charging labour as a gesture of goodwill since it failed literally the day after they changed the tyre on that corner during its 2-year service... Hrmph.
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