Symptoms
- Drone flies close to or hits obstacles it should detect
- Obstacle warning icon doesn't appear in the app
- Avoidance sensors work sometimes but not consistently
- Feature works outdoors but not indoors, or vice versa
Likely causes
- CommonObstacle avoidance disabled or set to a limited mode in settingsSome flight modes intentionally disable avoidance for sport or manual flying.
- CommonLow light reducing sensor effectivenessMany obstacle sensors rely on visible light or contrast to work well.
- PossibleThin, reflective, or transparent obstacles that sensors struggle to detectGlass, wires, and thin branches are notoriously hard for sensors to see.
- PossibleDirty or obstructed sensor lenses on the drone bodyDust or fingerprints on sensor covers can reduce detection range.
- Less commonSensor hardware faultWould show consistent failure across all lighting and obstacle types.
What to do
- Check the flight app settings to confirm obstacle avoidance is enabled and not in a bypass mode.
- Fly in adequate lighting, since most obstacle sensors perform poorly in low light or darkness.
- Be extra cautious near thin objects like wires, branches, or glass, which many systems can't reliably detect.
- Clean the sensor lenses on the drone body gently with a soft cloth.
- Test avoidance behavior with a large, well-lit, non-reflective object at a safe distance first.
- Update the drone's firmware, since sensor performance is sometimes improved through updates.
- Never rely solely on obstacle avoidance in any drone; always fly with visual awareness, and have sensors checked professionally if they consistently fail on obvious obstacles in good light.
Tools and parts
- Soft cloth
When to call a pro
If avoidance consistently fails on clear, well-lit obstacles, a drone repair specialist can test the sensor hardware.
Safety
Use caution
Never rely entirely on obstacle avoidance to prevent a crash; always maintain visual line of sight and manual control readiness.