Code
P0509
Idle
Circuit régulateur de ralenti — signal haut
Le circuit du régulateur de ralenti lit trop haut.
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Most likely causes
- Vanne IAC défectueuse
- Circuit ouvert
Symptoms you may notice
- High idle
Checks to run
- Test the valve
- Check wiring
Tools you may need
Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.