OBD-II Diagnostic Trouble Code
P0400
Exhaust Gas Recirculation Flow
P
Powertrain
engine / trans
engine / trans
0
Generic
SAE standard
SAE standard
4
Auxiliary emission controls
00
Exhaust Gas Recirculation Flow
Severity · general guide
Moderate
Fix soon — usually won't strand you
Code type
Generic
System
Powertrain