Collision Avoidance System?

Tiny
CHARLESTUCK
  • MEMBER
  • 2014 MERCEDES BENZ S550
  • 4.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 78,880 MILES
Sometimes the car applies the brakes regardless of the following distance.
Thursday, March 12th, 2026 AT 9:34 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,112 POSTS
I would do a CAN scan first before replacing anything, but to me it sounds like the proximity sensor in the front of the car is bad. Here is a video to show you how to do the first step.

CAN SCAN - https://youtu.be/u-4syLc-ifQ

Problems can occur if:

1. Dirt or bugs cover the sensor
2. The grille/emblem area is dirty
3. The bumper has been bumped or repaired
4. Radar alignment is off

The radar may need recalibration with a scan tool and target board, or the sensor itself is bad but the scan should have a code for it. Please let me know what you find, Ken
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Friday, March 13th, 2026 AT 9:59 AM

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