P025FTurbocharger/Supercharger Boost Sensor B Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Boost sensor B is a second boost pressure sensor, for a second turbo or bank on twin-turbo engines or a second stage. P025F counts brief excursions of its signal outside the valid range that are too short for the low or high code – the counterpart of P025E, which Ford sets after 10 such events in one drive cycle. No manufacturer using sensor B codes was found; the description follows CARB's input monitoring requirement and Ford's sensor A check.
- What you may notice
- Check engine light on
- Occasional loss of power
- Boost limited
- Likely causes
- LikelyLoose contact or corrosion at the sensor B connector
- PossibleWire breaking from vibration or heat
- PossibleSensor B faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.