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Code

P0401

Emissions / EGR

Débit EGR insuffisant

Pas assez de gaz recirculé, souvent dû à l’encrassement.

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Most likely causes

Van EGR encrassée
Van EGR défectueuse
Solinéide EGR bouché

Symptoms you may notice

Check engine light
Spark knock under load
Failed emission test

Checks to run

Inspect the EGR valve for carbon
Clean EGR passages
Test EGR operation

Tools you may need

Socket set EGR cleaner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Emissions / EGR

Défaut circuit vanne EGR

Capteur position EGR — signal bas

Défaut débit EGR

Vanne EGR — plage / performance

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