Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Ford Fusion Energi PlatinumFACTORY OEM SERVICE PROCEDURE
DTC P04ED - EVAP System Large Leak Detected - Fresh Air Side
P04ED - EVAP SYSTEM LARGE LEAK DETECTED - FRESH AIR SIDE
| Description: | The evaporative emission (EVAP) system is monitored for no purge flow, the presence of a large fuel vapor leak, or multiple small fuel vapor leaks between the EVAP leak detection control module and the fuel tank isolation valve. This DTC sets when no purge flow, which is attributed to fuel vapor blockages or restrictions, a large fuel vapor leak, or multiple fuel vapor leaks are detected by the EVAP monitor. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST HX . | ||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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