Range Rover P38a EAS Fault

I have recently been experiencing a EAS fault on my RR P38a. Some months ago i had repleced x1 of the sensors on the front N/S, this cured that fault. However, since this new fault has occured im interested in obtaining a Self-Fault Diog kit for use with home lap-top. Could anybody advise me on weather these types of units can identify the fault in detail in order for replacement, without spending unnecessary money or if there could be any DIY fix.