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Maybe oil pressure sensor is conking out? I've personally only had the light come on once, and it ended up being MAP sensor.
Obviously I'm going super broad over here as they're totally different bikes; but the architecture for Triumph diagnostics should be similar-ish.
I bought this, but got zero results from it. Seems to be highly rated, so well worth a punt?
http://dealertool.co.uk/
I'm on a 2013. It was a pain in the ass finding anything that worked. From what I was told, software just isn't available to read Triumph ECU's. Only proper workshop stuff is.
Honestly, it wasn't worth the hassle of trial and error with readers and whilst I normally work on my bikes, in this case, I just took it in.
What's showing on the speedo?