P0474 code meaning
Exhaust Pressure Sensor A Circuit Intermittent/Erratic
Powertrain system Generic code P04xx codes Check engine light
What P0474 means
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 gasoline engines include it in the electrical checks (5 s). A Ford bulletin fixed P0474 on the 2018 6.7-litre with a software update.
P0474 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0474
- Check engine light on
- EGR and turbo control on a substitute value, possibly reduced power
- Exhaust brake or warm-up flap without function
Common causes of P0474
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust pressure sensor aSensor wiringEngine control module
What each part of P0474 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 74 | The exact fault in that area. |
What to do next
- Note P0474 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0474
What does P0474 mean?
P0474 means "Exhaust Pressure Sensor A Circuit Intermittent/Erratic". 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). It is a generic code, so it means the same on every make.
Is it safe to drive with P0474?
Drive gently and only to a workshop. With P0474 the car can go into limp mode (reduced power) to protect itself.
Will P0474 fail an emissions test?
Yes, it can. P0474 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0474 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0474 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.