What does code P1390 mean on Ford vehicles?
The octane adjustment system reports values outside the allowed range.
OBD-II Code Ford
P1390 — Ford — Octane Adjust Out of Range
The octane adjustment system reports values outside the allowed range.
Common symptoms
- Detonation
- reduced engine performance
Possible causes
- Incorrect fuel octane
- faulty sensor
Initial recommendation
Use correct fuel grade and verify related sensors.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Ford code P1390 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands