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P0401 Diagnostic Trouble Code Discussion for April 2006

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1999 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WJ52M4X
P0401: Insufficient EGR Flow Detected. egr ports are restricted,(still has slight flow) i have verified this. can the passage ways on this 3.1 be successfully cleaned by removing the upper intake plenum, or would the lower need to be removed as well. customer recently had this to the dealer and the...
April 12, 2006
1998 Toyota Camry CE 2.2L MIL Lamp on VIN: JT2BG22K6W
P0401: EGR System Insufficient Flow Detected. ... light. Scanned computer for codes and found code #P0401. Tested vacuum to valve and verrfied valve needs to be replaced. After replacing EGR valve and vacuum modualtor, code is till coming back on. EGR solenoid seems to be working and Valve is holding pres...
April 12, 2006