The code reader didn't arrive today, so I'm still in the dark regards the cause and the light is still on. I have recently disconnected the RCCM, whilst I try to fix a burnt track in it's PCB. It's odd that the EML has appeared within 6 miles of me doing this. Te RCCM shouldn't control anything except the Climate Control, however I have noticed that the boot only opens on the fob now, not with the button in the car or on the boot. Could be a connection, but I wanted to see what the code reader said before I put the RCCM back in, as yet unfixed. I'll put it back in as is and see what happens..... What are going to do about your EML, is it a new cat needed or a sensor?