Powertrain, generic · Auxiliary emission controls

P0472 Exhaust Pressure Sensor A Circuit Low

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. P0472 means the signal voltage is below its limit – Ford diesels below 0.1 V for 2 s, Ford petrol engines below 0.21 V for 5 s. The cause is a signal shorted to ground, an interrupted 5 V reference or a faulty sensor; on Ford petrol engines the code must be clear before the EGR valve and hose checks run.

Likely causes

Signal wire shorted to ground
5 V reference open or shorted (often shared with other sensors)
Sensor faulty internally
Connector damaged by heat or corrosion

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€50–400
Time0.5–2.5 h

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

Parts involved

exhaust pressure sensor asensor wiringengine control module

Related codes

P0470P0471P0473P047C

References: fordservicecontent.com, fordservicecontent.com, law.cornell.edu.