Insufficient air flow means not enough air is moving for the task at hand. For example, a clogged filter will not let enough air through, creating insufficient air flow.
Trouble code P0411 means: Secondary Air Injection (AIR) System Insufficient Air Flow Detected
insufficient egr flow
The air flow affects the performance of an air filter by determining how efficiently it can capture and remove particles from the air passing through it. Insufficient air flow can reduce the filter's effectiveness, while proper air flow allows the filter to work optimally in trapping contaminants.
insufficient egr flow
P0401 - EGR flow insufficient , P0402 EGR flow excessive
Exhaust gas recirculation insufficient flow detected
PO491 Secondary Air Injection System Insufficient Flow (Bank 1)
Trouble code P0411 means: Secondary Air Injection (AIR) System Insufficient Air Flow Detected
po401 mean Exhaust Gas Recirculation Flow Insufficient Detected.
Insufficient air flow into your engine is the first thing that comes to my mind, also a dirty mass air flow sensor. Change your filter if dirty and clean your MAF with electrical cleaner.
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
Trouble code P0491 means:Secondary Air Injection System Insufficient Flow (Bank 1)