Thanks for reply, I'm happy to know that it should be possible.... Could you check my step, if I did something wrong compared to you? So Karoq Aug-2023 with kessy got message on console please change key battery 2 days after I bough a CR2032 varta new battery Karoq, engine and contact off, all door closed but not locked Second key away I'm close to the car.... Should I go away? Open the key, remove the battery, install the new one, close the key, press button to lock or unlock the doors--> no action, touch the door handle, nothing (LED on the key will go on if I press a button or touch the door handle, so battery and communication key and kessy system should be OK. Retry the same operation, but push a key button after removing the battery, reinstall, --> same problem ??? After I try that procedure to resynchronize but it is just "Bull****": Press any button on the key Unlock the door within 1 minute with the key via the locking cylinder