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P0401 Diagnostic Trouble Code Discussion for July 2004

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M7T
P0401: Insufficient EGR Flow Detected. After performing the normal checks E.G.R. valve was excersised using snap on scanner, and engine idle quality changed sufficently to be acceptable. M.A.P. sensor and mechanical vacuum gauge recorded similar readings in responce to E.G.R. opening. When vehicle ...
July 13, 2004
1996 Toyota Camry DX 2.2L MIL Lamp on VIN: 4T1BG12K6T
P0401: EGR System Insufficient Flow Detected. help!!
July 27, 2004
1995 Ford Crown Victoria LX 4.6L MIL Lamp on VIN: 2FALP74WXS
P0401: Insufficient EGR flow. ... CEL/MIL on. Code P0401 was set and PID for DPFE showed no activity with 70%+ command. Checked for vacuum supply to EGR which was OK, and when I supplied vacuum to EGR, there was no engine RPM change. Also, from past experiences, knew that DPFE voltage was ...
July 29, 2004
1998 Ford F-150 4.6L Misfire, MIL Lamp on VIN: 1FTZX17246
P0401: insuffient egr flow. truck came in with a check engine light & a miss.code po402 excessive egr flow & po304 # 4 cylinder misfire.replace all plugs and plug wire set. customer wanted that done. replace egr valve, it was all carbon up.voltage on dpfe was high, 4.86v all the ...
July 29, 2004