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.
2005 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
Engine Control System - DTCS U1000 To P0430
- DTC U1000, U1001: Can Communication Line
- DTC P0011, P0021: IVT Control
- DTC P0031, P0032, P0051, P0052: Ho2S1 Heater
- DTC P0037, P0038, P0057, P0058: Ho2S2 Heater
- DTC P0101: MAF Sensor
- DTC P0102, P0103: MAF Sensor
- DTC P0112, P0113: IAT Sensor
- DTC P0117, P0118: ECT Sensor
- DTC P0122, P0123: TP Sensor
- DTC P0125: ECT Sensor
- DTC P0127: IAT Sensor
- DTC P0128: Thermostat Function
- DTC P0132, P0152: Ho2S1
- DTC P0133, P0153: Ho2S1
- DTC P0134, P0154: Ho2S1
- DTC P0138, P0158: Ho2S2
- DTC P0139, P0159: Ho2S2
- DTC P0171, P0174: Fuel Injection System Function
- DTC P0172, P0175: Fuel Injection System Function
- DTC P0181: FTT Sensor
- DTC P0182, P0183: FTT Sensor
- DTC P0222, P0223: TP Sensor
- DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308: No. 8-1 Cylinder Misfire, Multiple Cylinder Misfire
- DTC P0327, P0328, P0332, P0333: KS
- DTC P0335: CKP Sensor (Pos)
- DTC P0340: CMP Sensor (Phase)
- DTC P0420, P0430: Three Way Catalyst Function
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.