u/Necessary-Cake-4918

2021 Tesla Model 3 Performance – HW3 replacement / Toolbox 3 help needed

Hello everyone,

I own a 2021 Tesla Model 3 Performance (Fremont, LHD) with FSD Computer 3 / HW3.

I have been experiencing intermittent problems with the car:

• cameras sometimes unavailable
• GPS sometimes incorrect/unavailable
• Autopilot unavailable
• the car computer seems to reboot repeatedly
• Service Mode shows repeated APS_w169_TurboA_SCS_LKUP errors
• sometimes the infotainment screen also goes completely black, although the vehicle itself still drives normally.

Tesla has diagnosed the HW3 Car Computer as needing replacement.

I live in French Guiana, where there is no Tesla Service Center. Because of the distance, I am considering purchasing the correct HW3 directly from Tesla and having an independent technician install it.

My main question is:

Has anyone here replaced a HW3 Car Computer themselves using Tesla Toolbox 3?

I would especially like to know:

1. Can the new HW3 be associated with the vehicle using Toolbox 3?
2. Can the VIN/configuration be transferred without going to a Tesla Service Center?
3. What level of Toolbox authorization is required?
4. Has anyone successfully completed the entire replacement through an independent repair shop?
5. Are there any specific procedures or precautions I should know before ordering the replacement HW3?

Any experience, documentation, or advice would be greatly appreciated.

Thank you!