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It means there is insufficient flow within your EGR (Exhaust Gas Recirculation) system.
While it could be a faulty component such as the dfpe sensor, the EGR solenoid or the EGR valve itself it is most often clogged passages. These are between the throttle body and the intake manifold (under the gasket - you won't find them unless you remove the gasket). Carb cleaner will dissolve the carbon build up.
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