P04F2: There is a fault in the catalytic converter heater power supply voltage (bank 1)
There is a fault in the catalytic converter heater power supply voltage (bank 1). It usually comes from the battery, the alternator or a poor connection.
| Code | P04F2 |
|---|---|
| System | Engine and transmission |
| Group | P04xx, Emissions control |
| Type | Generic: it means the same on every make |
How to read and clear P04F2 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 P04F2 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
- P04E8 The EGR temperature sensor D gives a higher signal than normal
- P04E9 The EGR temperature sensor D fails now and then
- P04F0 High load purge line A of the fuel vapour system is not working properly
- P04F1 The evaporative emission system purge line gives readings outside the normal
- P04F3 There is a fault in the catalytic converter heater power supply voltage (bank 2)
- P04F4 The catalytic converter heater (bank 1) gives a lower signal than normal
- P04F5 The catalytic converter heater (bank 2) gives a lower signal than normal
- P04F6 The catalytic converter heater (bank 1) gives a higher signal than normal
- 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 P04F2 mean?
There is a fault in the catalytic converter heater power supply voltage (bank 1). It usually comes from the battery, the alternator or a poor connection.
How do you clear P04F2?
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, P04F2 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.
