UI family
UI_a166_fsError
Not Available
What does the UI_a166_fsError alert mean?
A post-boot filesystem error occurred at runtime
What you'll see in your Tesla
- Not Available
What triggers it
Kernel reported filesystem errors for onboard storage device
When it clears
Filesystem reformatted or error-corrected
Potential impact
Various UI errors, loss of logs, profile settings, or other data stored on infotainment system
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
Track your Tesla's alerts automatically
Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.