P0404Medium urgency
EGR Circuit Range/Performance
Emission · EGR System
⚠️ Safe to drive — fix before emissions test.
What this means
The EGR valve position sensor reports the valve is not moving to the commanded position. Often caused by carbon buildup.
Likely causes
- Carbon-clogged EGR valveMost common
- Failed EGR valve position sensorCommon
- EGR vacuum solenoid failureCommon
Estimated repair cost
EGR valve replace$200 – $500
EGR cleaning service$100 – $250
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Frequently asked questions
What does P0404 mean?
The EGR valve position sensor reports the valve is not moving to the commanded position. Often caused by carbon buildup.
Is P0404 serious?
Safe to drive — fix before emissions test.
How much does it cost to fix P0404?
Repair costs for P0404 range from $200 – $500 depending on the root cause and your vehicle.
Can I drive with P0404?
You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.