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P0401 Diagnostic Trouble Code Discussion for August 2014

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2003 Mitsubishi Diamante LS 3.5L MIL Lamp on VIN: 6MMAP67P73
P0401: Insufficient EGR Flow Detected. Vehicle arrived with P0401 code stored and active. checked egr for blockage- egr port clear and valve opens and closes. Next went and checked vacuum source at throttle body. It is supposed to have a ported vacuum source and I attached my gauge to the port on t...
August 02, 2014
2009 Volkswagen Jetta TDI 2.0L MIL Lamp on
P0401: egr flow. ... (08213) and p0401 (01025) code The flap valve in throttle works but I am unsure if this is for that valve or the runner flaps. I command egr on and it tries to open but it is all carboned up. My main question is about p2...
August 05, 2014
2006 Mazda 6 Mazdaspeed 2.3L MIL Lamp on VIN: JM1GG12L46
P0401: EGR System Insufficient Flow Detected. ... intermittent P0300. We replaced the spark plugs 3K miles ago for maintenance purposes only, no drivability issues. Recently the vehicle has a check engine light and also will not start right up (usually have to crank twice to get it to start intermittently...
August 13, 2014