Exhaust gas recirculation (EGR) system - valve lift insufficient
Honda · emissions
Data confidence80%
The control module detected a fault associated with the Exhaust gas recirculation (EGR) system - valve lift insufficient circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Honda.
Powertrain: engine, transmission and driveline systems.
1
Manufacturer-defined range: the meaning can differ between brands.
491
Specific fault index within the subsystem.
Frequently asked questions about P1491
What does P1491 mean?
Exhaust gas recirculation (EGR) system - valve lift insufficient. The control module detected a fault associated with the Exhaust gas recirculation (EGR) system - valve lift insufficient circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Honda.
Is P1491 generic or manufacturer-specific?
P1491 is a manufacturer-specific code. In this database it is documented for: Honda. The same number can mean something different on other brands.
Can TuningBot remove P1491 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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