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Q: I had a 420 code replaced cat and both o2 sensors. Put over 200 miles on it. on 2001 Toyota Camry

Still have a 420 code insuficent converter. Please advise
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A P0420 has nothing to do with fuel trim. The wonderful USA government mandated that the manufactures have to monitor the cat efficiently. I think cardoclll is correct, you don't have the proper cat on.
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