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P0401 Diagnostic Trouble Code Discussion for January 2015

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1998 Ford F-150 Lariat 5.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRX17L8W
P0401: EGR flow insufficient. Ok, after reading the repair history, the customer came back, saying that truck was running worse. Scan data gave 4 codes. I had explained the last 2 times he was here that we needed to diag/repair the Fuel Pressure Sensor, because its reading a constant 5v. ...
January 06, 2015
1996 Toyota Celica GT 2.2L MIL Lamp on
P0401: EGR System Insufficient Flow Detected. This problem started after replacing the engine short block with a reman unit. The car has a a DTC for low egr flow that returns consistently with two trips on the freeway of ~10 min each. I first checked the vacuum hose routing and replaced all vacuum hoses i...
January 13, 2015
2003 Suzuki Vitara 2.0L MIL Lamp on VIN: 2S3TE52V63
P0401: Exhaust Gas Recirculation Insufficient Flow. I retrieved dtc p0401 performed egr test with solis no rpm change removed egr valve and verified pintle movement checked for vacuum supply at intake port very strong went a step further and removed intake tube from valve to intake and found very clean and clea...
January 22, 2015