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 PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0139: HO2S2 CIRCUIT SLOW RESPONSE - BANK 1 OR DTC P0159: HO2S2 CIRCUIT SLOW RESPONSE - BANK 2DTC CONFIRMATION TEST (USING CONSULT-II)
2003 Nissan-Datsun Frontier Base, Standard
DTC Confirmation Test (Using CONSULT-II)
2003 Nissan-Datsun Frontier Base, StandardSECTION DTC Confirmation Test (Using CONSULT-II)
- Start engine and warm to normal operating temperature.
- Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed at 3500-4000 RPM for at least one minute with no load. Allow engine to idle for one minute.
- Select HO2S2 (B1)/(B2) P0139/P0159 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II. Start engine. Follow instructions on CONSULT-II screen.
- Press SELF-DIAG RESULTS. If OK is displayed, system is okay at this time. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If CANNOT BE DIAGNOSED is displayed, go to next step.
- Stop engine. Allow engine to cool until COOLAN TEMP/S indicates less than 158°F (70°C). Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. When COOLAN TEMP/S reaches 158°F (70°C), return to step 2 .
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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.