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P0420 code 4runner 2000

5K views 2 replies 3 participants last post by  coontai 
Code P0420 is catalytic converter efficiency below normal.

The computer checks output of the O2 sensor before and after the converter. If the output is not what is expected it assumes the converter has problem.

The issue with the gauges appear to be wiring or a wire connection. The two gauges may not be getting power and reading low as the result of not having power.
 
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