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Code

P0400

Emissions / EGR

Défaut débit EGR

Le débit EGR n’est pas conforme.

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Most likely causes

Vanne EGR encrassée
Passages bouchés
Vanne défectueuse

Symptoms you may notice

Check engine light
Rough idle
Spark knock

Checks to run

Inspect the EGR valve
Clean passages
Test the valve

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

Débit EGR insuffisant

Défaut circuit vanne EGR

Capteur position EGR — signal bas

Vanne EGR — plage / performance

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