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Accessing the rear parking sensors

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Hello,

My wife's 2015 Model S ended up with the two rearmost parking sensors (in the center of the bumper) pushed in and down, and now she's getting constant backup warnings. This seems like something I could do myself, but I can't figure out how to access them. I've had the four bolts around the rear diffuser off, and I can't get it to move.

I've had the thought that with a small dowel and a bit of superglue I could probably pull them into position, but I have no idea how fragile they are.

Has anyone had any success getting these sensors back in place without calling Tesla Service?

Thanks,

Fred
 

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I'm not sure if you're gonna have enough room to get in there with the bumper beam. Might as well drop the fascia. It's just a few more bolts inside the liftgate area & 1 bolt on each side of front end of bumper by the wheels. I didn't remove the wheels at all. I just jacked up rear end. I had to drop fascia when I retrofitted bumper reinforcement for the jumpseats.
 
I have essentially this same problem, detailer knocked one loose. Where do I look for all the bolts? I ran into a Tesla mobile service tech at a supercharger last week, and he told me that pulling the bumper cover off was the only way to fix those sensors.