P0420 Code

dr_pepsi_B to Mechanic Advice@gearhead.townEnglish · 10 months ago

I have a 2005 Toyota Corolla. Check engine light came on last year. I replaced catalytic converter last year, both O2 sensors last week and have added a catalytic cleaner recently and followed the directions to a tee. My check engine light is still on throwing that code. Any other suggestions what it might be?

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