To avoid these and other problems that can occur at some time, I would check whether the car’s manual already contains the chapter „KESSY". There is an "emergency start" function for this.
If the batteries in the KESSY key are empty, the car can no longer be started. It might be possible that, for example the BCM, doesnt allow the coding "KESSY installed", which would mean that it has to be replaced by a newer one. Also, make sure that the car accepts the coding of the involved control units mentioned below. Before starting the retrofit, I recommend reading this entirely. For the mechanical information (how to change door handles to KESSY door handles, mounting locations of all the kessy antennas, etc.), refer to ELSA. This article only describes the hardware and software part of the retrofit. 
Since they are expensive, it's recommended to ask around if someone can lend them.
The retrofit requires complex software adjustments (not just coding), also there must be wired a lot. The system connects to the immobilizer, so only with VCDS you don't get far here. Important for people who do not have a second car available. The car remains fully functional during the retrofit. This has the advantage that KESSY can be retrofitted slowly (because this is not done quickly in a day) without the ZV or other systems to be affected. So basically this retrofit is installed "additionally" into the car. KESSY does not replace the ZV, but extends it. The reader needs to know what KESSY is and understand its function. Before start retrofitting, make sure to read VW SSP 493 to get an in-depth understanding of how KESSY actually works. 
Also the information provided here may not be valid for every and any car model, there might be slight differences. Make sure to recheck the wiring diagrams and all part numbers for the car to be retrofitted.Think carefully if you really want to do this - it was by far the most difficult and time consuming of all the retrofits done by the author so far. This retrofit is only recommended for people who are experienced in automotive electrics and already have retrofit experience.
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