P0420 Oxygen Sensor Hack

Here's how to hack your oxygen sensor to get rid of a P0420 OBDII code 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 often indicating the catalytic converter needs to be replaced. Catalytic converters can get quite expensive for an OEM replacement, and since these codes often show up on cars that are older, it i

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