Quote:
Originally Posted by EODguy
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Rear suspension is now down do to this resistor (so far) and of the 3 I've found from wrecks all were toasted. I am hopeful that the stealer has one in stock.
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The part number in your photo is for a classification resistor for an E70, not an E53. E53 part would be 27107557345.
Also, it is my understanding is that the classification resistor is specific to each
vehicle and is part of the calibration to allow for production tolerances in the xDrive clutch plates. I don't know if you can simply replace it (without some form of re-calibration). 
And what the hey has it go to do with your rear suspension issue?
Also, what did you mean when you said your OBD2 is dying? The photo of the connector didn't have any clues... or was it just that the connector had fallen apart...?
*edit* - found this statement regarding the classification resistor...
Coding Resistor
Manufacturing tolerances lead to varying curves of the multi-disc clutch. Because of this, the actual locking torque is be measured on a test bench during manufacturing. Because of varying manufacturing tolerances in the transfercase when they are manufactured, a resistor equaling these locking torque characteristics is mounted to the transfercase. Everytime the engine is started, the transfer case control unit measures the resistance and the correct program map is selected.
https://us.autologic.com/news/bmw-x3...-transfer-case