obd2 · obd2/P0401
P0401
Exhaust Gas Recirculation Flow Insufficient Detected
The PCM has detected less EGR flow than commanded, often due to a clogged EGR passage or a stuck-closed EGR valve.
The PCM has detected less EGR flow than commanded, often due to a clogged EGR passage or a stuck-closed EGR valve.