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no replies............decided to use "justask" and got a good answer from a BMW expert. He said my car was made during a time when the leak sensor system switched between a DMTL system and an NLVD system. Not sure which is the new and which is the old but mine is NLVD even though the VIN specific wiring diagram shows DMTL. He sent me the NLVD wiring diagram which shows the sensor as a separate unit from the pump that pressurizes the tank for sensing a leak. Sensor is mounted on top of the fuel pump located under the left side rear passenger seat. I can buy a replacement sensor from parts dealers (e.g., ECS Tuning, pn 16137333588) but the BMW dealer will not sell the stand alone sensor. They will only sell the entire fuel pump which includes the sensor. I know the fuel pump was a recall item in older F07 models but not the 2016. Not sure if BMW is just greedy and wants to sell more expensive parts or if there is something still fundamentally wrong with the fuel pump and therefore they won't sell only the sensor. Anyway, I have a lead on how to fix the problem. Hopefully it is a bad sensor and not an open circuit in the main wiring harness. I'll post an update after I learn more since no one seems to know much about all this.
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