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P0401 Diagnostic Trouble Code Discussion for January 2005

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1997 Toyota Camry CE 2.2L Excessive Emissions VIN: JT2BG22K1W
P0401: EGR System Insufficient Flow Detected. The EGR valve appears to be functioning. it moves up and down with the reving of the engine. I have replaces the EGR modulator valve (New) and reset the dash light. Lasted about 50 miles and light came back on. Can the EGR valve be bad or is the fact that it i...
January 04, 2005
1996 Toyota Camry DX 2.2L relentless P0401 cod VIN: JT2BG12K1T
P0401: EGR System Insufficient Flow Detected. ... insists that EGR flow is insufficient & keeps tripping code P0401. In Massachusettes, the CEL light cannot be on to pass emissions test. This ongoing problem has plagued me for a week! The EGR valve IS opening, EGR gas IS flowing (pipe to valve gets r...
January 13, 2005
2000 Ford F-150 XL 4.2L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on, rich exh. VIN: 1FTZF1824Y
P0401: egrinsufficient flow. Hi gang,this sucka is running "RICH"!Customers complaint was;ck. eng. light has come-on+running rough,Pulled codes=po172+po175=both banks "system too rich. So i did the usual ck. of live data/ freeze-frame etc, power balance/compr. tests=o.k. , did...
January 20, 2005