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Not quite the same problem but FYI
My 135i had a persistent problem with the TPMS - long-story short the TPMS computer failed and dealer wouldn't replace it (I argued but it really was my fault). Anyway, dealer wanted something like $550 to replace it so I said no knowing that I could do it for less. I found the computer on-line for $60 + $15 shipping and it took me about 30 minutes to replace - and I didn't know how to take the trunk-liner apart so I was learning as I was doing; the dealer presumably knows how to take the liner our fast.
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