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International Automotive Technicians Network
Re: P0420 Clearing
Posted to Technical Discussion Forum on 3/5/2013

Dave,

If you do nothing it takes three good trips to clear the light. Once cleared it is a History code and remains in memory for 40 warm up cycles if not cleared by the scan tool. If you leave it in memory it will also retain the freeze frame. If a DTC of l... Login to read more.