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P0401 Diagnostic Trouble Code Discussion for February 2009

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2000 Toyota RAV4 2.0L MIL Lamp on VIN: JT3GP10V5Y
P0401: EGR System Insufficient Flow Detected. Car came in with MIL on. Pulled P0401 EGR insufficient flow. scan tool data shows MAP sensor working properly. Applied vacuum directly to EGR valve and engine immediately stalls. Inserted a vacuum "T" and hooked up guage. less than one inch of vacuum a...
February 10, 2009
1999 Honda Accord EX 2.3L Excessive Emissions, MIL Lamp on VIN: JHMCG55801
P0401: EGR System Insufficient Flow Detected. Hi everyone. A friend of mine from out of town called me about her Honda with this code. Since I can't remember, does the 2.3 engine usually restrict on all 4 intake runners or around the egr valve? Any luck on cleaning without removal?
February 14, 2009
1997 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K5V
P0401: EGR System Insufficient Flow Detected. ... the check engine light is back on again for a code P0401 egr flow insufficient. Whe I had it the first time Egr was testing good,transducer tested good, all vacuum supplies applied at right time. I relpaced the vsv heard they go bad, and might not be able ...
February 17, 2009
2003 Hyundai Santa Fe 2.4L lack of power VIN: KM8SB12B73
P0401: EGR System - Insufficient Flow Detected. Car came in with a lack of power complaint. Checked engine compression, found all cyliders high, #1 210 psi, #2 225 psi, #3 210 psi, #4 225 psi. (spec is 170 psi) Removed exhaust sytem at the cylinder head to see if an exhaust restriction was causing the probl...
February 25, 2009