Every 3 series in existence through the mid 2000 had rear subframe issues. Typically there are bushings that fail that cause movement that ultimately leads to the failure.



What preventative maintenance have you done on the rear suspension? Have you replaced anything? Or just drove it until it broke. Tesla is no different than any other manufacture, this is a repair that falls on you. At 170k wanting them to replace it? that's Ludicrous! $2,000 seems more than reasonable...



Want a warranty? Buy a new car?

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