P1423
FordEGI Functionality Test Failed
The vehicle’s control system detected that the EGI functionality test did not produce the expected result. This identifies a failed system test, not a confirmed failed part. The exact meaning of EGI and its function depend on the vehicle’s model, year and engine.
⚠️ Before You Begin (Safety First)
This code alone does not establish an immediate safety hazard. If the vehicle is stalling, running severely poorly, overheating, or losing power in a way that makes driving unsafe, stop driving and have it checked. Otherwise, arrange diagnosis rather than replacing parts based on the code alone.
Common Symptoms
- The check-engine light may be on because the functionality test failed.
- There may be no noticeable change in how the vehicle runs.
- If the affected EGI system influences engine operation, drivability or fuel economy may be affected; this is not established by the code alone.
- An emissions or system-monitoring test may not complete or pass, depending on the vehicle.
Common Causes
- A component in the EGI system may not respond as commanded.
- Damaged, loose or corroded wiring or connections may interfere with control or feedback.
- A mechanical restriction or sticking component may prevent the system from operating as expected.
- A monitoring input or control issue may cause the test to detect an unexpected result.
- The code may be accompanied by another fault that affects the functionality test.
Diagnostic Steps
- Record all stored codes and available freeze-frame or scan data before clearing anything; related faults can help explain why the test failed.
- Use vehicle-specific service information to identify what EGI refers to on this model, year and engine; do not assume the acronym identifies the same system on every Ford.
- With the vehicle safely parked and the ignition off, visually check accessible, identified EGI-system wiring and connectors for looseness, damage or corrosion.
- Inspect any related accessible hoses or lines only if the vehicle-specific information identifies them as part of the EGI system.
- If the code returns or the system cannot be identified confidently, have a technician test its control and feedback signals before replacing components.
When to Call a Professional
Confirm the vehicle-specific meaning of EGI and review all related codes and available scan data before testing parts. Check the relevant wiring, connections, control response and feedback signals using service information for the exact vehicle. The failed test does not by itself prove that any particular component needs replacement.
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Commonly Asked Questions
Does P1423 prove that an EGI component has failed?
No. It reports that the EGI functionality test failed. Wiring, connections, mechanical operation, feedback or another related fault can contribute, so diagnosis is needed before replacing a part.
What does EGI mean on my Ford?
The code definition alone does not establish the exact system meaning for every vehicle. Check service information for the specific model, year and engine.
Can the vehicle have P1423 without obvious symptoms?
Yes. A functionality test can fail while the vehicle still seems to run normally. Symptoms depend on the system involved and the cause.
Can I keep driving with P1423?
The code alone does not determine whether the vehicle is safe to drive. If it runs normally, arrange diagnosis; stop driving if it stalls, runs severely poorly, overheats or becomes unsafe to control.
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