Code
P0404
Emissions / EGR
Vanne EGR — plage / performance
La vanne EGR n’atteint pas la position demandée.
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Most likely causes
- Carbone dans la vanne
- Capteur de position
Symptoms you may notice
- Check engine light
- Rough idle
Checks to run
- Clean the EGR
- Test position sensor
- Verify movement
Tools you may need
EGR cleaner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.