For some reason my bluetooth reader didn't "speak to" the ECU on my 2004 Subaru yet worked on all the other cars I tested. I went for my MOT yesterday and they lent me a wired reader before the test which worked fine and the code has now been cleared (P0420). I think it may be an O2 sensor, I am planning on making some changes to the cats early next year so will see how it goes up until then.
I have now got a Maxiscan wired reader which seems to work fine.
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