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Definition of check engine code P1491:
Acura:
EGR valve Lift Insufficient Detected
Citroen/Peugeot:
Secondary Switch Solenoid Circuit Malfunction
Ford:
Secondary Switch Solenoid Circuit Malfunction
Honda:
Exhaust Gas Recirculation (EGR) Valve Insufficient Lift (EGR)
Infinity:
Vacuum Cut Valve Bypass Valve
Isuzu:
EGR Valve Lift Insufficient Detected
Mercedes:
A/C refrigerant pressure too high
Nissan:
VC Cut/V BypasS/V
Plymouth:
Radiator Fan Control Relay Circuit Open Or Shorted
Saab:
EVAP Tank Pressure Sensor. Performance Problem and malfunctional fuel level sensor.
Subaru:
POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM