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Hi all. Thanks in advance for your help.

I have a 2007 Legacy Outback, automatic trans, 2.5L non-turbo. I'm being haunted by a P0420 code. Tried replacing the downstream O2 sensor, ran fuel cleaner through it, tried a new injector, cleaned the throttle body - it still comes up every once in a while.

My reason for not replacing the convertor is that I'm not 100% convinced that's the problem. I've noticed that the CEL comes on when my fuel tank starts to get low - when I fill up and drive for a day or so, the light goes off again. I don't want to spend hundreds on a part I don't need; any suggestions?
 
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