P0420 O2 Sensor Hack - Search Videos

Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check engine light and pass an emissions test. The P0420 code is thrown when the computer detects irregularities in the signal coming off of the secondary oxygen sensor. If the catalytic converter is operating at less than 95% efficiency, the code comes up ...

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