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International Automotive Technicians Network
Re: Pontiac code PO401=EGR
Posted to Technical Discussion Forum on 11/22/2005

Edwin,

According to what I read the PCM looks for RPM drop not map on this code for this vehicle. It only tests above 25 mph with rpms between 900 - 1100 and if it doesn't see at least 50 rpm drop 6 of 8 tests. It will only run 3 tests per ignition cycle so ... Login to read more.