When I first put mine in to check the codes the mechanic suggested that it might go off by itself and it might just be due to a tank of some dodgy fuel. Unfortunately that wasn't the case in my situation and I was getting P0141 everytime the car was started, but if I was you I wouldn't worry too much unless it comes back again.
I've had P0133 twice now, I'm giving it another time before I go about getting it replaced.
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