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-DATSUN2012SENTRA SE-RREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - DTCS U0101 TO P0159 (QR25DE)DTC P0122, P0123: TP SENSORON BOARD DIAGNOSIS LOGICFAIL-SAFE MODE
2012 Nissan-Datsun Sentra SE-R
Fail-Safe Mode
2012 Nissan-Datsun Sentra SE-RSECTION Fail-Safe Mode
When the malfunction is detected, ECM enters fail-safe mode and the MIL illuminates.
| Engine operation condition in fail-safe mode |
|---|
| The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor. |
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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.