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Update: I've decided against replacing the NOX sensor as members on another forum have pointed out there could be several issues and to find the culprits a specialized BMW dealer should read it out with proper diagnostic software. So I'll write the seller the findings were inconclusive but most likely a NOx sensor needing replacement but I want a better garage to provide a better rapport. My parts and labor warranty ends on the ��13th of December so it will be tricky to get costs back and also the car could give out during my holiday which will f**k it up tremendously but then at least I have irrefutable proof the car was faulty from the start and a higher chance of getting a refund under the Consumers Rights Act. Just ruminating how to write this all in the most strategic possible way in the letter to the seller.
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