Modern driver assistance systems depend on precise aiming. Radar sensors, cameras, and ultrasonic modules are all calibrated to tight tolerances. Even a few millimetres off can cause misreads or failures.
Here are the most common workshop mistakes that can throw ADAS sensors out of alignment and how to avoid them.
1. Bumper Replacements Without Calibration
Front and rear bumpers often house radar and parking sensors. Replacing or even loosening these without checking sensor positioning is one of the most common causes of calibration drift.
Watch out for:
Radar not being re-centred
Tabs or mounts bent slightly during removal
Plastic bumper covers that do not sit flush with the original alignment
2. Windscreen Replacement Without Camera Recalibration
Forward-facing cameras usually sit behind the windscreen. After a glass change, the camera’s angle to the road may be off by just enough to affect lane keeping or AEB.
Always check whether the vehicle requires dynamic or static calibration after windscreen replacement.
3. Wheel Alignments Without ADAS Checks
Changes in camber, toe, or thrust angle can affect how the camera or radar “sees” the road. A vehicle with perfect wheel alignment might still have an off-centre radar reading if the sensor was not checked after adjustment.
If a car has ADAS and a wheel alignment is performed, verify whether a calibration is recommended.
4. Ride Height Modifications or Suspension Work
Lowering kits, lift kits, or suspension repairs can all affect radar and camera angles. Many ADAS sensors are mounted based on ride height geometry. If the height changes, the aiming changes too.
Always check OEM procedures after suspension or ride height adjustments.
5. Missed or Skipped Scans
Sometimes the sensors are perfectly fine but the system has stored a fault or lost its calibration status. A pre- and post-repair scan can help catch these early.
Never rely on warning lights alone. Some systems will stay silent until they are needed and fail to activate.
Final Tip
A perfectly repaired panel or component does not guarantee the tech inside it is working correctly. When in doubt, scan it. Check the calibration requirements. Document the result.
What looks minor on the outside can lead to major failures if a sensor is even slightly out of line.