B Klasse Parking Aid Problem

I had a similar issue on my B Klasse where the parking assist went completely bonkers. First, check the control module, as it could be a simple fuse issue. Also, has there been any recent work done on the car that might have disturbed the wiring to the parking sensors?

Good call on the control module and fuse. I will check that. As for recent work, nothing major, just routine servicing. When you say 'bonkers,' do you mean completely non-functional, like mine, or just intermittent errors? Also, where is the control module located exactly?

Yeah, 'bonkers' meant totally dead – no parking assist at all. The rearview camera was also affected, making reversing a nightmare. The control module location can vary slightly, but it's usually behind the trim in the trunk, near the spare tire well. If it's not a fuse, and you're not comfortable with wiring, I'd take it to a workshop. It could save a bigger headache later.

Thanks for the advice. I checked the fuse box and the radar sensors but nothing obvious. I ended up taking it to a shop as suggested. It turns out it was a corroded connector on one of the sensors, just like I thought. 90€ and it's fixed. I appreciate the help!