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P0401 Diagnostic Trouble Code Discussion for October 2005

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1997 Ford F-150 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTDF1726V
P0401: egr fault. READ RELATED REPAIR HISTORY AND TESTING BEFORE THIS PARAGRAPH AND YOU MIGHT NOT BE AS CONFUSED.upon inspection i noticed a definite internal eng. noise that was somewhat intermittent. r/s exh. manifold bolts loose. dpfe hoses both have holes in them and intern...
October 04, 2005
2000 Isuzu Trooper S 3.5L MIL Lamp on VIN: JACD5S8X6Y
P0401: Insufficient EGR System Flow Detected. this isuzu is a pain. car came in with p0401 no egr flow. i have tested the grounds, v ref, map sensor and removed the intake to see if port is glogged. generic scan tool is all i have, data is limited. per the mitchell test i had drop of the map so i thought ...
October 06, 2005
1996 Toyota Previa DX 2.4L MIL Lamp on VIN: JT3GK12M0T
P0401: EGR System Insufficient Flow Detected. Failed Ca Smog for DTC P0401 only. Vehicle has no other problem passing. Clean out of tailpipe, functional test of EGR passes. That is, when vacuum applied to EGR valve, vehicle dies. Source vacuum hose at EGR shows 7-10 inches of vacuum when warm engine is re...
October 06, 2005
1997 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTDX1767V
P0401: EGR Flow. We are having trouble pinpointing the fault for this code,the truck already had the EGR valve,solenoid, & DPFE sensor replaced w/ factory parts.The code always resets when the monitors are ready.I did tests onthe system & wiring but found no problems u...
October 09, 2005
1998 Ford Windstar GL 3.8L MIL Lamp on VIN: 2FMZA5148W
P0401: egr flow insufficent. ... p0133,p0153,p0401. as i think code p0133 and p0153 require ecm re-calibration. van comming monday for check. any other thought. thanks in advance.
October 16, 2005
1998 Ford Windstar GL 3.8L MIL Lamp on VIN: 2FMZA5148W
P0401: egr flow insufficent. ... p0133,p0153,p0401. as i think code p0133 and p0153 require ecm re-calibration. van comming monday for check. any other thought. thanks in advance.
October 17, 2005
1997 Ford F-150 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTDF1726V
P0401: egr fault. READ RELATED REPAIR HISTORY AND TESTING BEFORE THIS PARAGRAPH AND YOU MIGHT NOT BE AS CONFUSED.upon inspection i noticed a definite internal eng. noise that was somewhat intermittent. r/s exh. manifold bolts loose. dpfe hoses both have holes in them and intern...
October 04, 2005
2000 Isuzu Trooper S 3.5L MIL Lamp on VIN: JACD5S8X6Y
P0401: Insufficient EGR System Flow Detected. this isuzu is a pain. car came in with p0401 no egr flow. i have tested the grounds, v ref, map sensor and removed the intake to see if port is glogged. generic scan tool is all i have, data is limited. per the mitchell test i had drop of the map so i thought ...
October 06, 2005
1996 Toyota Previa DX 2.4L MIL Lamp on VIN: JT3GK12M0T
P0401: EGR System Insufficient Flow Detected. Failed Ca Smog for DTC P0401 only. Vehicle has no other problem passing. Clean out of tailpipe, functional test of EGR passes. That is, when vacuum applied to EGR valve, vehicle dies. Source vacuum hose at EGR shows 7-10 inches of vacuum when warm engine is re...
October 06, 2005
1997 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTDX1767V
P0401: EGR Flow. We are having trouble pinpointing the fault for this code,the truck already had the EGR valve,solenoid, & DPFE sensor replaced w/ factory parts.The code always resets when the monitors are ready.I did tests onthe system & wiring but found no problems u...
October 09, 2005
1998 Ford Windstar GL 3.8L MIL Lamp on VIN: 2FMZA5148W
P0401: egr flow insufficent. ... p0133,p0153,p0401. as i think code p0133 and p0153 require ecm re-calibration. van comming monday for check. any other thought. thanks in advance.
October 16, 2005
1998 Ford Windstar GL 3.8L MIL Lamp on VIN: 2FMZA5148W
P0401: egr flow insufficent. ... p0133,p0153,p0401. as i think code p0133 and p0153 require ecm re-calibration. van comming monday for check. any other thought. thanks in advance.
October 17, 2005