P04FB: The sump ventilation hose connection sensor gives readings outside the normal
The sump ventilation hose connection sensor gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P04FB |
|---|---|
| System | Engine and transmission |
| Group | P04xx, Emissions control |
| Type | Generic: it means the same on every make |
How to read and clear P04FB with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P04FB with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P04F7 The catalytic converter heater (bank 2) gives a higher signal than normal
- P04F8 The catalytic converter heater (bank 1) fails now and then
- P04F9 The catalytic converter heater (bank 2) fails now and then
- P04FA The control EGR temperature is above normal
- P04FC The sump ventilation system gives readings outside the normal range
- P04FD The EGR actuator A control processor gives readings outside the normal range
- P04FE The catalytic converter heater (bank 1) gives readings outside the normal range
- P04FF The catalytic converter heater (bank 2) gives readings outside the normal range
- P0400 Exhaust gas recirculation (EGR) flow malfunction
- P0401 Exhaust gas recirculation (EGR) flow insufficient
- P0402 Exhaust gas recirculation (EGR) flow excessive
- P0403 EGR control circuit malfunction
What does code P04FB mean?
The sump ventilation hose connection sensor gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
How do you clear P04FB?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P04FB comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
