Here you go!
http://engine-codes.com/p0422.html
Its the sensor telling you to run Terra cleaner!
SOURCE: How to clear OBD II
Take your car to an Automotive Parts Store. And they will clear the codes from the on board computers memory for you providing the necessary repairs have been made and don correctly. However the Catalatic Converter Needs to be replaced first or the computer will command the check engine light to come back on, even if the codes were to be cleared. Good Luck and have a Happy New Year. From Ernie @ RedDeer, Alberta, Canada.
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SOURCE: i have a 2001 kia sephia obd code p0422 i replaced
There should only be one "monitored" convertor on that car. The one before the last oxygen sensor
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