What does code P0400 mean?
EGR valve not recirculating exhaust gases correctly
OBD-II Code
P0400 — Exhaust Gas Recirculation Flow Malfunction
EGR valve not recirculating exhaust gases correctly
Common symptoms
- Rough idle
- hesitation
- strong odor
- high fuel consumption
Possible causes
- Carbon clogged EGR valve
- faulty DPFE sensor
- damaged vacuum hoses
Initial recommendation
Clean or replace EGR valve, inspect vacuum lines and sensors.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0400 with your vehicle's actual symptoms for more complete diagnostic guidance.
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