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.
2000 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS
DIAGNOSTIC TROUBLE CODES (DTC) LIST
| DTC | Description |
|---|---|
| P0100 | MASS Airflow (MAF) Sensor |
| P0105 | Absolute Pressure (AP) Sensor |
| P0110 | Intake Air Temperature (IAT) Sensor |
| P0115 | Engine Coolant Temperature (ECT) Sensor |
| P0120 | Throttle Position (TP) Sensor |
| P0125 | Engine Coolant Temperature (ECT) Sensor |
| P0130 | Left Side Or Right Side Front Heated Oxygen Sensor (HO2S) |
| P0131 | Left Side Front Heated Oxygen Sensor (HO2S) |
| P0132 | Right Side Front Heated Oxygen Sensor (HO2S) |
| P0133 | Right Side Front Heated Oxygen Sensor (HO2S) |
| P0134 | Front (Right & Left) HO2S Sensor |
| P0135 | Front (Right & Left) HO2S Heater |
| P0137 | Rear HO2S |
| P0138 | Rear HO2S |
| P0139 | Rear HO2S |
| P0140 | Rear HO2S |
| P0141 | Rear HO2S Heater |
| P0150 | Left Side Front Heated Oxygen Sensor (HO2S) |
| P0151 | Right Side Front Heated Oxygen Sensor (HO2S) |
| P0152 | Right Side Front Heated Oxygen Sensor (HO2S) |
| P0154 | Front (Right & Left) HO2S Sensor |
| P0155 | Front (Right & Left) HO2S Heater |
| P0157 | Rear HO2S |
| P0158 | Rear HO2S |
| P0159 | Rear HO2S |
| P0160 | Rear HO2S |
| P0161 | Rear HO2S Heater |
| P0171 | Fuel Injection System Function (Right & Left Bank) |
| P0172 | Fuel Injection System Function (Right & Left Bank) |
| P0174 | Fuel Injection System Function (Right & Left Bank) |
| P0175 | Fuel Injection System Function (Right & Left Bank) |
| P0180 | Fuel Tank Temperature (FTT) Sensor |
| P0300 | Cylinder Or Multiple Cylinder Misfire |
| P0301 | Cylinder No. 1 Misfire |
| P0302 | Cylinder No. 2 Misfire |
| P0303 | Cylinder No. 3 Misfire |
| P0304 | Cylinder No. 4 Misfire |
| P0305 | Cylinder No. 5 Misfire |
| P0306 | Cylinder No. 6 Misfire |
| P0307 | Cylinder No. 7 Misfire |
| P0308 | Cylinder No. 8 Misfire |
| P0325 | Left Or Right Side Knock Sensor |
| P0330 | Left Or Right Side Knock Sensor |
| P0335 | Crankshaft Position (CKP) Sensor |
| P0340 | Camshaft Position (CMP) Sensor |
| P0400 | EGR Function |
| P0402 | EGR Control Backpressure Transducer (EGRC-BPT) |
| P0420 | Three-Way Catalyst Function |
| P0430 | Three-Way Catalyst Function |
| P0440 | EVAP Control System |
| P0443 | EVAP Canister Purge Volume Control Valve (EVAP-CPVCV) |
| P0446 | EVAP Canister Vent Control Valve (EVAP-CVCV) |
| P0450 | EVAP Control System Pressure Sensor (EVAP-CSPS) |
| P0455 | EVAP Control System |
| P0500 | Vehicle Speed Sensor (VSS) |
| P0505 | Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) Valve |
| P0510 | Closed Throttle Position (TP) Switch |
| P0600 | A/T Communication Line |
| P0605 | ECM |
| P1105 | Manifold Absolute Pressure (MAP)/Barometric Pressure (BARO) Solenoid |
| P1110 | Left Side Intake Valve Timing Control (IVTC) |
| P1120 | Secondary Throttle Position Sensor (STPS) |
| P1125 | Tandem Throttle Position (TP) Sensor |
| P1135 | Right Side Intake Valve Timing Control (IVTC) |
| P1140 | Left Side Intake Valve Timing Control (IVTC) Position Sensor |
| P1145 | Right Side Intake Valve Timing Control (IVTC) Position Sensor |
| P1148 | Closed Loop Control |
| P1168 | Closed Loop Control |
| P1210 | Traction Control System (TCS) Signal Circuit |
| P1220 | Fuel Pump Control Module (FPCM) |
| P1320 | Ignition Signal |
| P1336 | Crankshaft Position (CKP) Sensor (POS) |
| P1400 | EGRC Solenoid |
| P1401 | EGR Temperature Sensor |
| P1402 | EGR Function |
| P1440 | EVAP Control System |
| P1444 | EVAP Canister Purge Volume Control Valve (EVAP-CPVCV) |
| P1446 | EVAP Canister Vent Control Valve (EVAP-CVCV) |
| P1447 | EVAP Control System Purge Flow Monitoring |
| P1448 | EVAP Canister Vent Control Valve (EVAP-CVCV) |
| P1490 | Vacuum Cut Valve By-Pass Valve |
| P1491 | Vacuum Cut Valve By-Pass Valve |
| P1492 | EVAP Canister Purge Control Solenoid (EVAP-CPCS) |
| P1493 | EVAP Canister Purge Control Valve (EVAP-CPCV) |
| P1605 | Automatic Transmission (A/T) Control |
| P1706 | Park/Neutral Position (PNP) Switch |
Factory Service Tools
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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.
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