You are offline — AutoTools still works from your device.

Code

P0403

Emissions / EGR

Défaut circuit vanne EGR

Le circuit de commande de la vanne EGR a un défaut.

Search another code

Most likely causes

Vanne EGR défectueuse
Câblage
Fusible grillé

Symptoms you may notice

Check engine light
Rough idle
Spark knock

Checks to run

Test the EGR valve command
Check wiring and fuse
Inspect for carbon

Tools you may need

Multimeter OBD-II scanner

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

Related codes in Emissions / EGR

Débit EGR insuffisant

Capteur position EGR — signal bas

Défaut débit EGR

Vanne EGR — plage / performance

Ask the AI mechanic

Hi! Ask me anything about your car — codes, noises, parts, maintenance.