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P0401 Diagnostic Trouble Code Discussion for August 2006

Insufficient EGR Flow Detected *

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Trouble Ticket Help Requests for DTC P0401

	Help Request	Posted
	1999 Acura RL Premium 3.5L MIL Lamp on VIN: JH4KA9656X P0401: EGR System Insufficient Flow Detected. This car stumbles but does not die when egr is opened manually. Does it have a tube similar to the 3.2 engine? I don't know if it's related but it also has a traction controll code for tps signal that lead to the trac mod with no fix. We ate $800 mod and two ...	August 03, 2006
	1996 Acura RL 3.5L MIL Lamp on VIN: JH4KA9647T P0401: EGR System Insufficient Flow Detected. MIL light comes on after starting engine (on all the time). Vehicle was at another shop (Acura/Honda specialists) were they performed intake manifold cleaning (was not that plugged) and replaced EGR valve. Vehicle came to our shop with same code and we perform...	August 04, 2006
	2003 Volkswagen Jetta TDI 1.9L MIL Lamp on VIN: 3VWSP69M73 P0401: EGR flow insufficient. how can i pinpoint this problem? i have modis that will communicate and a generic tool that works ok. does this car need ecm reflash? the code resets within 10 min of driving and the freeze data is similar each time. any info would be greatly appreciated. than...	August 04, 2006
	2004 Ford F-250 Super Duty Harley-Davidson Edition 6.0L MIL Lamp on VIN: 1FTNW21PX4 P0401: Insufficient EGR Flow Detected. Hi there, I have a Ford F250 here which just wont go away, I have previously posted a similar request and following the replies i changed the exhaust back pressure sensor and the fault virtually went away. what it does now is less often but still occurs, the m...	August 05, 2006
	2004 Ford F-250 Super Duty Harley-Davidson Edition 6.0L MIL Lamp on VIN: 1FTNW21PX4 P0401: Insufficient EGR Flow Detected. Hi there, I have a Ford F250 here which just wont go away, I have previously posted a similar request and following the replies i changed the exhaust back pressure sensor and the fault virtually went away. what it does now is less often but still occurs, the m...	August 06, 2006
	2000 Honda Accord EX 3.0L MIL Lamp on VIN: 1HGCG165XY P0401: EGR System Insufficient Flow Detected. we have cleaned the ports and eventually we replaced the egr valve, after 2 or more days, the same code reappears. thanks for any help.	August 11, 2006
	2001 Mazda Protege ES 2.0L Poor Idle Quality, Stall VIN: JM1BJ22531 P0401: EGR System Insufficient Flow Detected. car came to shop with erratic idle problem, also when in gear with foot on brake engine will stall. found engine codes listed above. performed system tests on related cicuits as per mitchell 1. no opens or shorts found in maf, iat, or egr electrical circuits f...	August 15, 2006
	1998 Oldsmobile Silhouette Premiere 3.4L MIL Lamp on VIN: 1GHDX03E0W P0401: Insufficient EGR Flow Detected. ... throwing p0401 code on first test drive after clearing code.Alldata isnt helping much.I can command up the egr and see the map sensor voltage and pressure go up.So I am not sure what else I need to look at that is making it fail.I also did a BG injection s...	August 22, 2006
	2000 Mazda Protege ES 1.8L MIL Lamp on VIN: JM1BJ2211Y P0401: EGR System Insufficient Flow Detected. ... light on, runs fine. has code p0401 egr insufficient flow detected. i checked vacume lines to the egr booster solonoid and sensor, i pulled the egr valve, not clogged at all, perfect. checked operation of solonoid with power probe, sounds ok, when i turn t...	August 28, 2006
	1999 Toyota Camry LE 2.2L MIL Lamp on VIN: JT2BG22K7X P0401: EGR System Insufficient Flow Detected. ... SES light on tested egr with vacuum pump at an idle. Egr opens at 8" of vacuum and engine stalls. Checked egr solenoid, opens at part throttle and above. Removed egr valve and cleaned ports to intake manifold and to exhaust system. Replaced egr modulat...	August 29, 2006