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P1491 Diagnostic Trouble Code Discussion for September 2005

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1491
Help Request Posted
2001 Honda Accord LX 3.0L Excessive Emissions, MIL Lamp on VIN: 1HGCG16461
P1491: EGR Valve Lift Sensor Insufficient Flow Detected. ... and cleaned all the passages in the intake but did not do the update as per service bulletin--don't ask why cause I don't know ?? All was well for a couple of weeks but now has come back with just the p1491 code and it sets immediately. when we manually en...
September 06, 2005