​Hey Scotty, I got 2004 nissan primera P12, I changed cat, both o2 sensors, no vacuum leak but still have p0420 code 😕 what now?

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ScottyKilmer
ScottyKilmer

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should have started with a nissan pro mechanic, it may just need computer reflashing, or you got a crappy cat that won't blend with the nissan software..