Doesn't look like they make a GAP Tool for 2004 Discovery II. Does anyone know of a good alternative?
Nanocom would be the closest thing to a GAP which would allow reprogramming of modules. For just code reading and adaptive resets the ICarsoft LR2 works well for this and can be found much cheaper than the Nanocom. If you just want to read and reset engine codes a simple ELM bluetooth odb2 code reader will work. These can be found on either amazon or ebay for around $10 USD.