Join Now
International Automotive Technicians Network

P0401 Diagnostic Trouble Code Discussion for June 2008

Insufficient EGR Flow Detected


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1999 Toyota Land Cruiser 4.7L MIL Lamp on VIN: JT3HJ85J4V
P0401: egr insufficent flow. ... Customer came in complaining check engine light on intermittently, we pulled code p0401 from scanner and found vac. switching valve open at all times and egr temp sensor only reading about 82 degrees. we replaced both. customer took car and light came back...
June 02, 2008
2005 Toyota RAV4 2.4L MIL Lamp on, VIN: JT3HP10V5W
P0401: egr flow problem. after clearing codes using aftermarket M.O.D.I.S. scanner check engine light illuminates , scan data indicates 1 code remains. clearing codes indicates a one flash of check engine light, no codes present, then illuminates on constantly. Egr tests indicate flow...
June 02, 2008
2001 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTRX17W31
P0401: Insufficient EGR Flow Detected. During FIRST mile of test drive, EGR vac is coming on and EGR is operating normally. SECOND mile of test drive, EGR vac suddenly drops to zero and continues not to work for the rest of test drive. Return to shop, turn key off, restart engine, and repeat test d...
June 04, 2008
2004 Volkswagen Jetta TDI 1.9L No Start, Poor Idle Quality, Stall VIN: 3VWSR69M94
P0401: . This car was brought to me to replace the timing belt and waterpump. Customer furnished all parts and everything was supplied. We have done these before and have never had any problems. I do not do any work to the injection system on these cars because I do no...
June 14, 2008
2004 Volkswagen Jetta TDI 1.9L No Start, Poor Idle Quality, Stall VIN: 3VWSR69M94
P0401: . This car was brought to me to replace the timing belt and waterpump. Customer furnished all parts and everything was supplied. We have done these before and have never had any problems. I do not do any work to the injection system on these cars because I do no...
June 17, 2008
1997 Ford Escort LX 2.0L MIL Lamp on VIN: 1FALP13P9V
P0401: insufficient egr. car came in mil lite on.code 401,insufficient egr.scanned dpfe,.69 volts.dpfe dead.thought it was just another sensor problem,installed new sensor-plastic style.now i have 1.04 volts at idle,but only increases to 2.74,maybe 3.04 volts,with egr position opening...
June 18, 2008
1999 Toyota Land Cruiser 4.7L MIL Lamp on VIN: JT3HJ85J4V
P0401: egr insufficent flow. ... Customer came in complaining check engine light on intermittently, we pulled code p0401 from scanner and found vac. switching valve open at all times and egr temp sensor only reading about 82 degrees. we replaced both. customer took car and light came back...
June 20, 2008
2001 Ford Focus SE 2.0L MIL Lamp on VIN: 1FAFP36331
P0401: . replaced egr sensor, solinoid and egr valve.Cleaned egr tube and ports to sensor with wire and solvent,checked all vacuum tubing in system for leaks or blockage.When car is at idle and i ground egr sensor sensor pulls in and stalls car. how do i test to see if...
June 26, 2008
1999 Toyota Land Cruiser 4.7L MIL Lamp on VIN: JT3HJ85J4V
P0401: egr insufficent flow. ... Customer came in complaining check engine light on intermittently, we pulled code p0401 from scanner and found vac. switching valve open at all times and egr temp sensor only reading about 82 degrees. we replaced both. customer took car and light came back...
June 02, 2008
2005 Toyota RAV4 2.4L MIL Lamp on, VIN: JT3HP10V5W
P0401: egr flow problem. after clearing codes using aftermarket M.O.D.I.S. scanner check engine light illuminates , scan data indicates 1 code remains. clearing codes indicates a one flash of check engine light, no codes present, then illuminates on constantly. Egr tests indicate flow...
June 02, 2008
2001 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTRX17W31
P0401: Insufficient EGR Flow Detected. During FIRST mile of test drive, EGR vac is coming on and EGR is operating normally. SECOND mile of test drive, EGR vac suddenly drops to zero and continues not to work for the rest of test drive. Return to shop, turn key off, restart engine, and repeat test d...
June 04, 2008
2004 Volkswagen Jetta TDI 1.9L No Start, Poor Idle Quality, Stall VIN: 3VWSR69M94
P0401: . This car was brought to me to replace the timing belt and waterpump. Customer furnished all parts and everything was supplied. We have done these before and have never had any problems. I do not do any work to the injection system on these cars because I do no...
June 14, 2008
2004 Volkswagen Jetta TDI 1.9L No Start, Poor Idle Quality, Stall VIN: 3VWSR69M94
P0401: . This car was brought to me to replace the timing belt and waterpump. Customer furnished all parts and everything was supplied. We have done these before and have never had any problems. I do not do any work to the injection system on these cars because I do no...
June 17, 2008
1997 Ford Escort LX 2.0L MIL Lamp on VIN: 1FALP13P9V
P0401: insufficient egr. car came in mil lite on.code 401,insufficient egr.scanned dpfe,.69 volts.dpfe dead.thought it was just another sensor problem,installed new sensor-plastic style.now i have 1.04 volts at idle,but only increases to 2.74,maybe 3.04 volts,with egr position opening...
June 18, 2008
1999 Toyota Land Cruiser 4.7L MIL Lamp on VIN: JT3HJ85J4V
P0401: egr insufficent flow. ... Customer came in complaining check engine light on intermittently, we pulled code p0401 from scanner and found vac. switching valve open at all times and egr temp sensor only reading about 82 degrees. we replaced both. customer took car and light came back...
June 20, 2008
2001 Ford Focus SE 2.0L MIL Lamp on VIN: 1FAFP36331
P0401: . replaced egr sensor, solinoid and egr valve.Cleaned egr tube and ports to sensor with wire and solvent,checked all vacuum tubing in system for leaks or blockage.When car is at idle and i ground egr sensor sensor pulls in and stalls car. how do i test to see if...
June 26, 2008