DTC code
P0499
EVAP System Vent Valve Control Circuit High
Technical guide
reference — not individually verifiedSymptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Probable causes
- high: Control line open
- medium: Control line shorted to supply
- low: Connector pins corroded - high contact resistance
Diagnostic steps
Check the components involved: evap vent valve, evap vent wiring. Verify wiring and connectors before replacing any part. Job difficulty: easy. Typical European range — 80-250 EUR, 0.4-1.2 h. Reference values only.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0499
Nothing confirmed yet for this code. No guess is offered on purpose.
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