Identify which method failed
- Try the key buttons from close range.
- Try the NFC card only at the position shown in the ATTO 2 manual.
- Check whether the BYD app can still see the vehicle; do not repeatedly send commands.
- Move other electronic devices away from the key and retry once.
If the car remains locked
A weak key battery, discharged vehicle 12V battery or access-system fault needs different action. Use the mechanical access procedure in the manual only as written. Do not prise trim or force a handle.
When to seek help
If both keys fail, the vehicle appears electrically dead or the alarm/access warning persists, use BYD roadside assistance or an authorised repairer.
Step-by-step access diagnosis
- Stand beside the vehicle and test one physical key while keeping the other key and phone away.
- Test the physical key buttons, then the documented backup detection position.
- If available, repeat with the spare physical key.
- Only after physical-key testing, check NFC or phone access separately.
- Record exactly which method works and whether the vehicle shows any lights or message.
What the result means
- Spare key works: replace or inspect the first key battery and keep that key out of service until reliable.
- Backup position works: radio detection or key battery is a more likely focus than total vehicle power loss.
- Phone/NFC works but both fobs fail: investigate physical keys and receiver rather than deleting digital access.
- No method and no vehicle response: a low-voltage or vehicle fault needs roadside assistance.
Manufacturer reference
Use the linked manufacturer document or page alongside the instructions supplied with your exact vehicle.
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