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.
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HOMESERVICE MANUALSNISSAN-DATSUN2003FRONTIER BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0125: ENGINE COOLANT TEMPERATURE SENSORPOSSIBLE CAUSES
2003 Nissan-Datsun Frontier Base, Standard
Possible Causes
2003 Nissan-Datsun Frontier Base, StandardSECTION Possible Causes
Malfunction is detected when voltage sent to ECM from ECT sensor is not practical, even when some time has passed since starting engine; or engine coolant temperature is insufficient for closed loop fuel control. Possible causes are:
- ECT sensor circuit open or shorted.
- Defective ECT sensor.
- Defective thermostat.
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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.