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P1491 Diagnostic Trouble Code Discussion for January 2010

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1491
Help Request Posted
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 3N1CB51D61
P1491: EVAP Vacuum Cut Valve/Bypass Circuit Malfunction. ... with p1491 stored, Followed Nissan tsb, replaced vacuum cut bypass valve. Fault still sets intermittently and when the vehicle is filled with fuel it will idle poorly and hesitate from a stop for the first few minutes. We have bouble checked everything and...
January 21, 2010