Powertrain, generic · Auxiliary emission controls
P0473 Exhaust Pressure Sensor A Circuit High
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. P0473 means the signal voltage is above its limit – Ford diesels above 4.8 V for 2 s, Ford petrol engines above 4.80 V for 5 s. Typical is an open signal wire that the pull-up drives high, an open sensor ground, or a short to 5 V or battery voltage.
Likely causes
Signal wire open or sensor ground open
Signal shorted to 5 V or battery voltage
Sensor faulty internally
Connector loose or corroded
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
References: fordservicecontent.com, fordservicecontent.com, law.cornell.edu.