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 P1402: EGR FUNCTIONPOSSIBLE CAUSES
2003 Nissan-Datsun Frontier Base, Standard
Possible Causes
2003 Nissan-Datsun Frontier Base, StandardSECTION Possible Causes
Malfunction is detected when EGR flow is detected under conditions that do not call for EGR. Possible causes are:
- EGRC solenoid valve.
- EGR valve leaking or stuck open.
- EGR temperature sensor.
- EGRC Backpressure Transducer (BPT) valve.
RENDER: 1.0x
NO RELATED
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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.