kessy retrofit on 2017 cupra 300

Aug 18, 2025
1
0
Hello,
I have been offered a 2017 Cupra 300 at a pretty good price with low mileage, but unfortunately it does not have keyless entry (Kessy). Is it possible to retrofit Kessy, and if so, how much would it cost? I have managed to find various kits, but they are primarily for other cars from the MQB platform.
Thanks in advance for your responses.
 

cairus

Active Member
Jun 4, 2024
1,631
569
No, it is not possible as you cannot adapt the electronic steering lock to a car without factory KESSY. You also cannot buy KESSY keys for a car without factory KESSY.
I agree 95%. Officially, it's a project that died at the planning stage... if you take unofficial routes, it's possible. But the effort involved is enormous (which is why it's never been implemented). The costs are therefore very high. There's also the problem that if you ever go online with a Seat workshop tester, you'll run into problems.