OBD codes / P0404
P0404
ModerateExhaust Gas Recirculation (EGR) Circuit Range/Performance
Get it looked at soon to avoid further wear.
Likely causes
- faulty EGR valve or position sensor
- carbon buildup
- wiring/connector fault
Common fixes
- clean or replace the EGR valve
- inspect EGR wiring and connector
Seeing P0404 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0404 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.