ATTENTION: It is now possible to write areas $100 to $15F. In order to be able to write this area you need to have a working key. This is the area, that contains the Immobilizer data. Please be very careful when performing modifications here, because modifying some areas of the immobilizer data might lead to the car not being able to start because it will not be able to recognize the key (this is very much so in the component security range between $100 and $123). Another thing is that if you modify this area and have the error above it will not be writable again due to the lack of a working key. Should such events occur you will have to create and learn a new key to the car in order to restore the ability to write this section again.

There are a few ways you could approach this situation

• You can learn a brand new transponder.

• You can unlock the original key, make it a dealer key and learn it again, making the area writable again.