fault codes

Hi I posted on the general chat forum about this and was pointed to ecutalk software by Frank. I have installed and used it and it has come up with nats 1404,1405,1406 codes. Can anybody tell me what this relates to please. Am I right in thinking it is immobilized related.
 
Yes it's back to haunt me. I thought I had cured it with my previous fix. It has been fine since then, from what I have been reading today it seems it could be anything from corrosion to damaged wiring or dodgy fuses etc. I have cleared the fault codes with ecutalk and will try and investigate further, I hate intermittent electrical faults.
 
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