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P1491 Diagnostic Trouble Code Discussion for February 2010

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1491
Help Request Posted
1997 Honda Civic HX 1.6L MIL Lamp on VIN: 1HGEJ7122V
P1491: EGR Valve Lift Sensor Insufficient Flow Detected. ... system. Initially car came in with a p1491, EGR lift insufficient. We tested the lift sensor and found inaccurate reading to lift sensor position, so we replaced the EGR valve. A week later the car returned with a p0401, EGR insufficent flow. We removed t...
February 11, 2010
2001 Dodge Ram 1500 Laramie 5.9L No Start VIN: 1D7HA18ZX2
P1491: radiator fan relay fault or short. Thank you all in advance for your time and expertise. I have a no start, no spark, no injection pusle. driving me crazy. My Solus is back at snappy getting the critical falure removed, and I am limited to a obd2 reader at this time. I have power to the PCM on ...
February 24, 2010
2001 Honda Accord LX 3.0L MIL Lamp on VIN: 1HGCG22511
P1491: EGR Valve Lift Sensor Insufficient Flow Detected. I removed the intake and EGR valve to completely ream the passages with an old brake cable and drill. Cleaned up into the upper intake and down the lower intake passage to the EGR valve ports. Cleaned the EGR valve. Carb sprayed all passages and blew out with ...
February 24, 2010
2000 Honda Accord EX 3.0L MIL Lamp on VIN: 1HGCG165XY
P1491: EGR Valve Lift Sensor Insufficient Flow Detected. ... get this one fixed. Intially came in with mil on dtc p1491 only. Tech replaced egr valve. Came back in week later with the mil on dtc p1491 only ( codes were prevously cleared). I function tested the valve and would not really affect the idle. Removed the ...
February 28, 2010