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P0401 Diagnostic Trouble Code Discussion for August 2004

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1995 Mercury Grand Marquis LS 4.6L MIL Lamp on VIN: 2MELM75W0S
P0401: egr flow insufficient detected. check engine light on with code po401. (egr flow insufficient detected).checked wiring for bad connection, disconnected and cleaned the sensor and computer connections. disconnected and cleared code two to three times. the code came back in about 10 miles. con...
August 07, 2004
1995 Mercury Grand Marquis LS 4.6L MIL Lamp on VIN: 2MELM75W0S
P0401: egr flow insufficient detected. check engine light on with code po401. (egr flow insufficient detected).checked wiring for bad connection, disconnected and cleaned the sensor and computer connections. disconnected and cleared code two to three times. the code came back in about 10 miles. con...
August 08, 2004
1994 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN52L8R
P0401: EGR flow error. ... MIL keeps coming back on after being drove aprox 1000 miles. With the same codes in memory P0401 and P1406. I have cleaned the EGR ports and replaced the EGR valve twiced the second time was with a AC delco part and still getting the same code. I have test...
August 25, 2004
1997 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K8V
P0401: EGR System Insufficient Flow Detected. originally when vehicle was is, attempted to diagnose system according to diagnostic chart and suspected vacuum modulator may be faulty.installed new modulator and customer said after 3 days light was on. usually stays on but he said it will go out intermitten...
August 26, 2004
1999 Toyota Camry LE 3.0L MIL Lamp on VIN: JTSBF28K8X
P0401: EGR System Insufficient Flow Detected. ... comes on every drive cycle. It has codes p0402, p0401, Excessive egr and isuffecient egr. Yet Every time i check it at the control solenoid and at the egr position sensor it operates fine. I assume that a glitch occurs while driving I just wanted to see if...
August 27, 2004
1995 Mercury Grand Marquis LS 4.6L MIL Lamp on VIN: 2MELM75W0S
P0401: egr flow insufficient detected. check engine light on with code po401. (egr flow insufficient detected).checked wiring for bad connection, disconnected and cleaned the sensor and computer connections. disconnected and cleared code two to three times. the code came back in about 10 miles. con...
August 07, 2004
1995 Mercury Grand Marquis LS 4.6L MIL Lamp on VIN: 2MELM75W0S
P0401: egr flow insufficient detected. check engine light on with code po401. (egr flow insufficient detected).checked wiring for bad connection, disconnected and cleaned the sensor and computer connections. disconnected and cleared code two to three times. the code came back in about 10 miles. con...
August 08, 2004
1994 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN52L8R
P0401: EGR flow error. ... MIL keeps coming back on after being drove aprox 1000 miles. With the same codes in memory P0401 and P1406. I have cleaned the EGR ports and replaced the EGR valve twiced the second time was with a AC delco part and still getting the same code. I have test...
August 25, 2004
1997 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K8V
P0401: EGR System Insufficient Flow Detected. originally when vehicle was is, attempted to diagnose system according to diagnostic chart and suspected vacuum modulator may be faulty.installed new modulator and customer said after 3 days light was on. usually stays on but he said it will go out intermitten...
August 26, 2004
1999 Toyota Camry LE 3.0L MIL Lamp on VIN: JTSBF28K8X
P0401: EGR System Insufficient Flow Detected. ... comes on every drive cycle. It has codes p0402, p0401, Excessive egr and isuffecient egr. Yet Every time i check it at the control solenoid and at the egr position sensor it operates fine. I assume that a glitch occurs while driving I just wanted to see if...
August 27, 2004