I have no cat and don't think there's anything in the exhaust system.
Code 21 might be because I was screwing around with the igniter and unplugging it while running to see if I could try and replicate the problem I experienced while driving. I'll reset the car tomorrow and see if the code is cleared but now that I think of it the problem is prolly cuz the igniter's way too close to the exhaust manifold. Seeing as it has to cool down before it starts again that might be it! Now I'm hoping that the car will die while I'm driving it so I can swap in my spare igniter and see if it solves the issue
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