First CEL today! Advice?

Ok, well I had it checked, both O2 sensors are good, the Cat is "lazy" as the mechanic said. The second o2 is reading similar to the first.
 
stupid lazy cat

lazy_cat.jpg
 
ARRRGGGHHH (rant)

it's back...same as before... P0455 (dark)


so, I noticed that it came back today when I was around a quarter tank of gas left. that's about the same amount of gas I had left when it came on the first time. and between now and first time I've filled up on gas once or twice I would say.

Any suggestions? Should I just never let my car get below a quarter tank? (scratch) lol
 
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