P1250 – Fuel Cap Sensor Circuit
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Symptoms
- Check fuel cap message
- EVAP monitor not ready
- Fuel odor
- Check engine light
- Emissions failure
Causes
- Loose or missing cap
- Faulty cap sensor
- Wiring issue
- Connector corrosion
- ECU logic fault
Diagnosis
- Inspect fuel cap
- Check sensor wiring
- Inspect connector
- Smoke test EVAP
- Scan live data
Repair
- Tighten or replace fuel cap
- Replace cap sensor
- Repair wiring
- Clean connectors
- Update ECU if needed