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Went through this recently myself. 2010 e70 35d. Was out of warranty by 3 months and 25k miles. BMW said they would not warranty, though I didn't push since I'm not super fond of the dealer near me anyways. Found several used at local junkyards and did end up with another bad one at first. So I would advise if you go this route to make sure you can get a refund if it doesn't work. Eventually found one from a 2013 (that looks like it has been previously replaced as it had a date code of 2017) for $80. Pretty simple to code to the car with WINKFP and NCS.
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