Has the key stopped locking / unlocking or the car wont turn over.if its the latter mine did this thought key had lost sync.turned out to be dodgy connection small terminal on starter motor.removed cleaned re fitted sound ever since.
see if the red LED in the dash is constantly on while u try to crank it...if it is it's immobilised and u need to introduce EKA code ...or try with an other roof receiver cos if the receiver failed(it can be bad earth too) and u unlocked with key the car is immobilised(i suppuse it was set for "key never" which means the alarm is armed/disarmed only by the fob)...in this case the only way to remobilise it is with the fob or with EKA... not even the tester can comunicate with the BCU while it's immobilised.