Have Lexus UX250h 2019 with all keys lost to program new keys, the best solution is to use Lonsdor K518ISE + H0440c + online calculation service. For this car model, Lonsdor K518ISE is not able to program the original key, but only use h0440c to program.
Look at Lonsdor FT11-H0440C Toyota Smart Key PCB 433.58MHz 434.42MHz:
Guide on how to program Lexus UX250h 2019 lost key using Lonsdor K518ISE:
Watch this video first, it used Lonsdor KH100, which shares as the same method as K518ISE.
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This is Lonsdor K518 newest update – Lexus Toyota smart key all keys lost and add key.
Step 1. Select ” Generate smart key.”.
Note: Internet needs to be connected.
Step 2. Put H0440C into the coil of Lonsdor k518ise / KH100, click on “OK” to start collecting data.
Choose PKE frequency.
Please check the car key frequency and choose accordingly.
Step 3. Keep all the car keys away from the car, and press the engine start button.
- Bring H0440C closer to the engine start location and wait for 10 seconds, until the light flashing, if there is no flashing light, try to press the engine start button again.
Note: if still no flashing light, most likely because the frequency was chosen wrongly.
After collecting, press OK.
Put back H0440C into KH100 / KH100+ / K518ISE coil and start key generation.
No collectable key been detected, please adjust the key position and try again.
Do you have the original car key? Click “NO” for all keys lost situation.
It will take about 2 minutes to calculate.
Turn on ignition successful.
Now, this newly generated H0440C is a working key for the car, also you can use it as an emulator to add other new key.