What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
3Original wording in English
FORD, LINCOLN
Reported code forms P04EF
Some 20132017 C-MAX Energi, 20172018 C-MAX Hybrid, 20132020 Fusion Energi and 2017-2020 Fusion/MKZ Hybrid vehicles may exhibit an illuminated malfunction indicator lamp (MIL) with any of the following diagnostic trouble…
AUDI
Reported code forms P04EF00
This bulletin contains repair instructions for DTCs P045600, and/or P044200, P04EF00, P04ED00.
FORD, LINCOLN
Reported code forms P04EF
Some 2013-2017 C-Max/Fusion/MKZ Hybrid/Energi vehicles may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P1450, P0456, P0457, P04EE and/or P04EF. This may be due to the…
Check vehicle applicability
34A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | A3 ETRON | 2015 |
| Audi | A3 SPORTBACK E-TRON | 2018 |
| Audi | A3 SPORTBACK E-TRON | 2017 |
| Audi | A3 SPORTBACK E-TRON | 2016 |
| Ford | C-MAX | 2017 |
| Ford | C-MAX | 2016 |
| Ford | C-MAX | 2015 |
| Ford | C-MAX | 2014 |
| Ford | C-MAX | 2013 |
| Ford | C-MAX ENERGI | 2017 |
| Ford | C-MAX ENERGI | 2016 |
| Ford | C-MAX ENERGI | 2015 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.