P0471Exhaust Pressure Sensor A Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The exhaust pressure sensor measures the pressure ahead of the turbine or in the manifold (Ford: turbine upstream pressure, Cummins: exhaust manifold pressure, older Ford diesels: EBP). The module uses it to calculate EGR flow, to control the variable turbine and engine braking, and to protect against overpressure. P0471 is the plausibility check of sensor A. Ford diesels compare it with ambient pressure with the engine off (at least 10 s stopped); a deviation above 15 kPa sets the code, including a sensor stuck mid-range. Ford petrol engines check it during the EGR monitor. FCA notes for Cummins diesels that P0471 often comes from real back pressure of a clogged particulate filter – then the sensor must not be replaced. Ford bulletins cover a sensor replacement on the 2.7 EcoBoost and coked sensing tubes on the 6.0 diesel.
- What you may notice
- Check engine light on
- EGR and turbo control on a substitute value, possibly reduced power
- Exhaust brake or warm-up flap without function
- Likely causes
- LikelySensor drifting or faulty
- LikelySensing tube or hose blocked or coked
- PossibleReal high back pressure from a clogged particulate filter or catalyst
- RareLeaking sensing tube or exhaust leak ahead of the sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.