I've got a 2.5S and the P0420 code has been around for a long time now, it came and went, it actually went off and i was able to smog my car with no issues, right on time for registration. But now, it is back and P2423 cam with it. Going off the blue driver, some of the reported fixes were tranny replacement, which would suck because i replaced it 2 years ago. I got a new car, and the altima was going to be sold, but my dad and gf both had their cars crap out. So i'm trying to keep it around to give to dad (gf currently driving it while her car gets fixed). Anyone have experience with this code? I'm also getting a transmission code: P0826. For reference, i'm adding the blue driver report. TIA!
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