Powertrain, generic · Auxiliary emission controls

P0474 Exhaust Pressure Sensor A Circuit Intermittent/Erratic

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. P0474 covers jumps of sensor A – and at Ford diesels more: in operation the measured pressure is compared with a back pressure model, and a deviation above 500 kPa or below −100 kPa for 2 s sets the code (1300–2400 rpm, warm engine). Ford petrol engines include it in the electrical checks (5 s). A Ford bulletin fixed P0474 on the 2018 6.7-litre with a software update.

Likely causes

Loose contact at connector or wire near the hot manifold
Sensing tube partly blocked (sluggish, jumping values)
Engine module software (Ford 6.7, 2018)
Sensor faulty

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€0–400
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

P0470P0471P0472P047E

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