P1491

Set by the manufacturer, so it means different things on different makes. 11 makes in the table below.

More codes than this one? Paste your whole scan

What P1491 means, by make 11 makes

Acura EGR valve Lift Insufficient Detected
Audi Tank ventilation valve 2-N333 interruption 45EB 17899
Citroen Secondary Switch Solenoid Circuit Malfunction
Ford Secondary Switch Solenoid Circuit Malfunction
Honda Exhaust Gas Recirculation (EGR) Valve Insufficient Lift (EGR)
Isuzu EGR Valve Lift Insufficient Detected
Mercedes-Benz A/C refrigerant pressure too high
Peugeot Secondary Switch Solenoid Circuit Malfunction
Saab EVAP Tank Pressure Sensor. Performance Problem and malfunctional fuel level sensor.
Subaru FUEL TANK SENSOR CONTROL VALVE RANGE/PERFORMANCE
Volkswagen Tank ventilation valve 2-N333 interruption 45EB 17899

Each line is that manufacturer's own meaning for P1491. They are genuinely different faults, not rewordings of one, so a meaning listed against one make says nothing about the others. If your make is not listed, we do not hold it - your manufacturer's service information is the authority.

Code structure P1491

Powertrain

engine, transmission and emissions

Manufacturer-specific

Defined by the vehicle manufacturer, so the meaning varies between makes.

Fault index

identifies the specific fault

Powertrain Manufacturer-specific

Nearby codes in the P1 range

Manufacturer code meanings from kierandrewett/obd (b56a07a), used under the MIT licence. Copyright (c) Kieran Drewett. SpareRadar is not affiliated with the dataset's authors.