OBD-II diagnostic trouble code
P0404Caution
Exhaust Gas Recirculation Circuit Range/Performance
The EGR valve's actual position doesn't match what the computer commanded, often from carbon buildup preventing full valve movement.
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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.
Frequently asked questions
Can I drive with P0404?
You can usually keep driving with P0404, but don't put it off — the underlying cause can get worse or lead to further damage the longer it goes unaddressed. Get it diagnosed as soon as you reasonably can.
How much does it cost to fix P0404?
The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.
What causes P0404?
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief