Powertrain, generic · Auxiliary emission controls

P0471 Exhaust Pressure Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Sensor drifting or faulty
Sensing tube or hose blocked or coked
Real high back pressure from a clogged particulate filter or catalyst
Leaking sensing tube or exhaust leak ahead of the sensor

Symptoms

  • Check engine light on
  • EGR and turbo control on a substitute value, possibly reduced power
  • Exhaust brake or warm-up flap without function

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–500
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Inspect sensor pipes
  2. Compare reading key-on engine-off
  3. Check DPF status

Parts involved

exhaust pressure sensor asensor wiringengine control module

Related codes

P0470P0472P0473P047BP2463

References: fordservicecontent.com, fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov.