I have had the same problem. if you still have the accesss code you can try this..
ENGINE IMMOBILISATION OVERRIDE
If the Plip key is lost or does not function, the emergency access code (EKA) can be used
to override the system as follows :-
1. Insert the key into the drivers lock, and turn to the lock position.
2. Hold the key in this position for 5 seconds.
3. Now using the code turn the key to the unlock the number of times of the first digit.
4. Now turn the key to the lock position the number of times of the second digit.
5. Repeat for the last two digits.
6. After the code has been entered, turn the key to the unlock position, and check to
see whether the Alarm LED has stopped flashing, and the engine will start.
If an error is made, open and close the door and repeat the sequence. If 3 unsuccessful
attempts are made, the system will lock out for 10 minutes, before another attempt can
be made.
I have the same problem. The above did not work for me but it has for others I have spoken to.
mark
August 2006