Code result
P0404
Exhaust Gas Recirculation Circuit Range/Performance
Moderate severity
What it means
The EGR valve does not move through its expected range or its position feedback does not track command. The valve may be sticking, the position sensor may be drifting or carbon buildup is preventing full travel.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Carbon buildup on EGR valve
highOne of the most commonly reported causes for this code — check this first.
Position sensor drift
mediumA plausible cause — test and verify before replacing parts.
Mechanical valve damage
lowLess common, but worth ruling out after the more likely causes.
Related help
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