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International Automotive Technicians Network
Re: PO401 CODE
Posted to Emissions Forum on 3/1/2016

Al, Thanks for your input on this, I am now going to get into the PCM/connectors at the sensors, And check for elec problems/Connectors I have already replaced the solenoid valve,and purge valves with new O.E the cust has driven it the past few days and when ... Login to read more.