Fuel Filler Cap and MIL

So I put some fuel into my new K11 Micra for the first time a few days ago - today I went for the first reasonably long drive since doing that (did a couple of very short trips earlier, without incident) and the Malfunction Indicator Light came on about 30 minutes into the journey (steady, not flashing).

I've read that when closing the fuel filler cap, it needs to be turned until the ratchet clicks - from memory, I don't think I heard it click when I closed it (my first time remember!)

Anyway, I've also read on Nissan forums that not closing the fuel filler cap properly can cause the MIL to come on - is this correct?
 
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