P1422
FordEGI Temperature Sensor Failure
The code indicates that the vehicle’s control system detected a problem with the EGI temperature sensor or its signal. That sensor provides temperature information used to monitor or control EGI operation. The code does not prove the sensor itself has failed; wiring, connector, or circuit problems can produce the same condition. Effects depend on the vehicle and may include a warning light, altered system operation, or no obvious change.
⚠️ Before You Begin (Safety First)
This code alone does not usually indicate an immediate danger. Avoid touching nearby exhaust components, which may be hot. Stop driving if the vehicle develops severe drivability problems, an overheating warning, or another condition that makes it unsafe to operate.
Common Symptoms
- The check-engine light may be illuminated because the control system has detected a sensor or signal problem.
- There may be no noticeable symptoms if the fault does not significantly affect system operation.
- EGI operation or engine-control behavior may change if the system relies on the temperature signal.
- Emissions may increase if the fault prevents the system from operating as intended.
Common Causes
- The EGI temperature sensor may have an internal fault.
- The sensor connector may be loose, damaged, or corroded.
- Wiring may be damaged or have an electrical fault that disrupts the sensor signal.
- A related circuit or control-system fault may be affecting the temperature reading.
Diagnostic Steps
- Record the code and check for related codes before clearing anything; related faults can help narrow the diagnosis.
- With the vehicle off and cool, visually inspect the sensor connector and accessible wiring for looseness, damage, corrosion, or contact with hot components.
- Reconnect a visibly loose connector only if it can be done safely and without forcing or damaging it.
- If you have a scan tool, check whether the reported temperature reading is plausible for the vehicle’s condition; do not assume the sensor is faulty based on the code alone.
- Have the sensor and circuit tested using vehicle-specific service information if the fault remains. Avoid probing terminals or replacing parts without a suitable test procedure.
When to Call a Professional
Confirm the code and check for related codes before replacing parts. Compare scan-tool temperature data with the system’s actual condition, then inspect the sensor connector and harness. Test the sensor and applicable circuit signals using the model-, year-, and engine-specific service information. Confirm normal readings and operation after any repair.
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Commonly Asked Questions
Does P1422 prove that the EGI temperature sensor needs replacement?
No. It identifies a detected sensor or signal problem. The sensor, connector, wiring, or related circuit may be responsible, so testing is needed before replacing parts.
Can I keep driving with this code?
The code alone does not establish an immediate safety problem. If the vehicle runs normally, arrange diagnosis; stop driving if severe drivability problems or another unsafe condition develops.
Can a wiring fault cause the same code as a failed sensor?
Yes. A damaged connection or wiring fault can disrupt the temperature signal and produce the same detected condition.
Will the vehicle necessarily feel different?
No. Some vehicles may show only a warning light, while others may change EGI or engine-control operation. The exact effect depends on the vehicle.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.