Toyota Camry: Obd Code P0420?

P0420 is indication to check / inspect Catalytic Converter.This means the that converter has failed. This is not a sensor issue. Do not let anyone change any of the O2 or AFR sensors. The converter needs replaced. This can be just the one in the front pipe and /or the one in the manifold depending on the VIN and emissions listed for that VIN. IF you live in CA or a state that requires emissions testing this will have to be repaired to pass the SMOG TEST. Otherwise you could ignore the light and keep driving. This will not hurt the engine. The aftermarket converters are cheaper for a reason. They do not last.Getting replace with original parts will give correct performance and last longer.

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