Meaning of FORD Code P1263
This code indicates a problem in the fuel injector circuit #3. Piezoelectric injectors deliver a precise amount of fuel into the combustion chamber. The PCM controls their activation (duration: 0 to 400 microseconds). If the injector interface module detects an anomaly in the secondary circuit (rear injector), code P1263 is displayed.
Symptoms of Code P1263
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Check engine light on (or “Service Engine Soon”)
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Rough idle
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Loss of power
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Increased fuel consumption
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Misfires (especially on the affected cylinder)
Possible Causes of FORD P1263
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Faulty fuel injector #3
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Damaged injector #3 wiring harness (open circuit or short circuit)
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Poor electrical connection (corrosion, bent pins, loose connector)
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Faulty injector interface module
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Ground or power supply issue
Diagnosis and Repair of Code P1263
1. Visual inspection of the injector circuit
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Check the wiring harness and connectors (especially under the valve cover).
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Look for cut, burned, or exposed wires.
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Inspect the connector pins (broken, bent, oxidized).
2. Testing injector #3
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Measure the injector resistance (compare with manufacturer specifications).
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Use an oscilloscope to check the control signal.
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If faulty, replace the injector.
3. Checking the injector interface module
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Test the module’s power supply and ground.
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If necessary, replace the module.
4. PCM check
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Check for related codes and real-time data with an OBD2 scanner.
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If the problem persists, PCM reprogramming or replacement may be necessary.
Common Repairs
✅ Replacement of faulty injector #3
✅ Repair of damaged wiring harness
✅ Cleaning or replacement of oxidized connectors
✅ Replacement of injector interface module
✅ PCM update or replacement
Conclusion
Code FORD P1263 indicates a problem in injector #3 circuit. A thorough inspection of wiring and connectors is essential before replacing expensive parts. If the problem persists, consult a specific repair manual or a qualified mechanic.
🔧 Technical tip: Use a multimeter and an oscilloscope for accurate diagnosis.