Quote:
Originally Posted by josiahg52
Make your dealer replace the NOx sensors and urea dosing module. Those are covered under a 120k/10yr extended warranty. It's more than likely not the SCR catalyst that is causing the 4D16 DTC. This will not be easy but lesrm about the system and make them do it.
While they're at it, maybe you can find fault with the active DEF tank that's covered also. Best to find document that states the extended warranty items and stipulations. Mine was sent to me from BMW NA via mail.
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My service advisor went over everything that would be covered under the extended warranty, The NOX sensors went bad as a result of the cat failing (his words), and they were replaced under warranty. He didn't mention anything about the urea dosing module but I brought my concerns for the DPF and he didn't think there was anything that warranted replacement yet.