Code
P1556
VW idle
Limite basse de régulation de ralenti dépassée (VW)
VW : le ralenti ne peut pas atteindre la limite basse.
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Most likely causes
- Fuite de vide
- Papillon encrassé
Symptoms you may notice
- Low or hunting idle
- Stalling
- Check engine light
Checks to run
- Clean the throttle body
- Smoke-test the intake
- Test idle control
Tools you may need
Throttle cleaner
Smoke machine
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.