Have you installed your plate holder yet?Hmm, I tried replying to this thread twice, but it hasn't appeared yet. Here's hoping the third time works.
I'm not 100% sure, but I believe the brake assist radar sensors are behind the 3-pointed star in the center of the grill. If your star has dark plastic infill between the points, then the sensors are behind it.
There are park assist proximity sensors on the front (and rear) of the car at bumper level. Your plate holder may be affecting the park sensors and triggering a warning.
I've ordered a different plate holder (Platypus-Pro from Cravenspeed) that the manufacturer claims is customized to each MB model to avoid interfering with the park sensors (only recent models). It's due to arrive on Monday, and I probably won't have time to install it until the weekend, but I'll report back once it's done and tested.
Here are the photos. I used some teflon tape on the threads of the extension and the bolt that fastens the plate to minimize having threaded parts frozen in place, if and when I want to remove it. I used a little pocket level to align the plate horizontally. I should find out tomorrow morning if the plate interferes with the parking sensors.Have you installed your plate holder yet?
Well, I tried various mounting positions using the extension arm and center-mounting plate, but they all generate occasional false park assist signals . So, I'm returning it for a refund. CravenSpeed included a priority mail envelope and prepaid return label with their additional parts!CravenSpeed is sending me an extension arm and a plate with a center mounting hole to try out, free of charge. I'll post again when I've been able to try it out.