P0474Exhaust Pressure Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- EGR and turbo control on a substitute value, possibly reduced power
- Exhaust brake or warm-up flap without function
- Likely causes
- LikelyLoose contact at connector or wire near the hot manifold
- PossibleSensing tube partly blocked (sluggish, jumping values)
- PossibleEngine module software (Ford 6.7, 2018)
- PossibleSensor faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.