P0420 Code -- 96' Honda accord -- 253k miles

I haven’t ran out of gas, but I’ve driven it down to 2 gallons several times. Is that bad?

New(and more) live data!

Engine Speed(idle): 711
MAP: 8.9
IAT (Down arrow) : 122/124
IGN advnc: 14.0 -15.5
ST FTRM(%) 1.6 to 2.6 up to 3.3
LT FTRM(%) 8.6
ST FTRM12: negative .80
OB2Stat: CA

What’s the TWC and what’s a TSB? Sorry not familiar with the lingo.

I hope it’s not the ECU. I’m going to check the air filter and see how that is doing. Back in a flash!(Of the ecu?)