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P0404: Exhaust Gas Recirculation Circuit Range/Performance
Severity: Low Usually safe to keep driving, but get it checked.
What does P0404 mean?
The EGR valve position does not match what was commanded.
Generic OBD-II definition: Exhaust Gas Recirculation Circuit Range/Performance. Confirm applicability in your vehicle service information.
Common causes
- Carbon-clogged EGR passages
- Stuck or faulty EGR valve
- Faulty EGR position sensor or DPFE sensor
- Cracked vacuum lines (older vehicles)
Symptoms
- Rough idle
- Hesitation
Can I keep driving with P0404?
Severity: Low Usually safe to keep driving, but get it checked.
If the check engine light is flashing or the car runs badly, stop driving and have it checked.
Typical fixes
- Inspect valve and wiring
- Clean or replace valve