Powertrain, generic · Auxiliary emission controls
P047A Exhaust Pressure Sensor B Circuit
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. No manufacturer document available to us uses sensor B – it would be a second sensor, for example on bank 2 of a twin-turbo engine; the description mirrors sensor A. P047A is the general circuit fault of sensor B, comparable to P0470 for sensor A (a sensor error status or raw values out of limits).
Likely causes
Sensor faulty internally
Connector corroded or heat-damaged near the manifold
Broken or chafed signal or 5 V wire
Engine module or software
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€80–400
Time0.5–2.5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
exhaust pressure sensor bsensor wiringengine control module
Related codes
References: law.cornell.edu, fordservicecontent.com.