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.
2001 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| Scan Tool DTC/MIL DTC | System/Circuit Affected | ||||||
|---|---|---|---|---|---|---|---|
| MIL 0208 | Cooling Fan Circuit | ||||||
| P0000/0505 | No Malfunction/Normal Condition | ||||||
| P0100/0102 | Mass Air Flow (MAF) Sensor/Circuit | ||||||
| P0105/0803 | Absolute Pressure (AP) Sensor/Circuit | ||||||
| P0110/0401 | Intake Air Temperature (IAT) Sensor/Circuit | ||||||
| P0115/0103 | Engine Coolant Temperature (ECT) Sensor/Circuit | ||||||
| P0120/0403 | Throttle Position (TP) Sensor/Circuit | ||||||
| P0125/0908 | Engine Coolant Temperature (ECT) Sensor/Circuit | ||||||
| P0130/0303 | Left Front HO2S (Circuit) | ||||||
| P0131/0411 | Left Front HO2S (Lean Shift) | ||||||
| P0132/0410 | Left Front HO2S (Rich Shift) | ||||||
| P0133/0409 | Left Front HO2S (Response Time) | ||||||
| P0134/0412 | Left Front HO2S (High Voltage) | ||||||
| P0135/0901 | Left Front HO2S Heater | ||||||
| P0137/0511 | Left Rear HO2S (Minimum Voltage) | ||||||
| P0138/0510 | Left Rear HO2S (Maximum Voltage) | ||||||
| P0139/0707 | Left Rear HO2S (Response Time) | ||||||
| P0140/0512 | Left Rear HO2S (High Voltage) | ||||||
| P0141/0902 | Left Rear HO2S Heater | ||||||
| P0150/0503 | Right Front HO2S (Circuit) | ||||||
| P0151/0415 | Right Front HO2S (Lean Shift) | ||||||
| P0152/0414 | Right Front HO2S (Rich Shift) | ||||||
| P0153/0413 | Right Front HO2S (Response Time) | ||||||
| P0154/0509 | Right Front HO2S (High Voltage) | ||||||
| P0155/1001 | Right Front HO2S Heater | ||||||
| P0157/0314 | Right Rear HO2S (Minimum Voltage) | ||||||
| P0158/0313 | Right Rear HO2S (Maximum Voltage) | ||||||
| P0159/0708 | Right Rear HO2S (Response Time) | ||||||
| P0160/0315 | Right Rear HO2S (High Voltage) | ||||||
| P0161/1002 | Right Rear HO2S Heater | ||||||
| P0171/0115 | Fuel System Lean-Left Bank | ||||||
| P0172/0114 | Fuel System Rich-Left Bank | ||||||
| P0174/0210 | Fuel System Lean-Right Bank | ||||||
| P0175/0209 | Fuel System Rich-Right Bank | ||||||
| P0180/0402 | Fuel Tank Temperature (FTT) Sensor | ||||||
| P0300/0701 | Multiple Cylinder Misfire | ||||||
| P0301/0608 | Cylinder No. 1 Misfire | ||||||
| P0302/0607 | Cylinder No. 2 Misfire | ||||||
| P0303/0606 | Cylinder No. 3 Misfire | ||||||
| P0304/0605 | Cylinder No. 4 Misfire | ||||||
| P0305/0604 | Cylinder No. 5 Misfire | ||||||
| P0306/0603 | Cylinder No. 6 Misfire | ||||||
| P0307/0602 | Cylinder No. 7 Misfire | ||||||
| P0308/0601 | Cylinder No. 8 Misfire | ||||||
| P0325/0304 (1) | Knock Sensor-Left Bank | ||||||
| P0330/0212 (1) | Knock Sensor-Right Bank | ||||||
| P0335/0802 | Crankshaft Position (CKP) Sensor/Circuit | ||||||
| P0340/0101 | Camshaft Position (CMP) Sensor/Circuit | ||||||
| P0400/0302 | EGR Function (Close) | ||||||
| P0402/0306 | EGR Control Backpressure Transducer (EGRC-BPT) | ||||||
| P0420/0702 | Three-Way Catalyst Function-Left Bank | ||||||
| P0430/0703 | Three-Way Catalyst Function-Right Bank | ||||||
| P0440/0705 | EVAP Small Leak (Negative Pressure) | ||||||
| P0443/1008 | EVAP Canister Purge Volume Control Valve (Circuit) | ||||||
| P0446/0903 | EVAP Canister Vent Control Valve (Circuit) | ||||||
| P0450/0704 | EVAP Control System Pressure Sensor | ||||||
| P0455/0715 | EVAP Large Leak | ||||||
| P0500/0104 | Vehicle Speed Sensor/Circuit | ||||||
| P0505/0205 | Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) Valve/Circuit | ||||||
| P0510/0203 | Closed Throttle Position (TP) Switch/Circuit | ||||||
| P0600/0504 (2) | A/T Communication Line | ||||||
| P0605/0301 | ECM | ||||||
| P0705/1101 | (3) Park/Neutral Position (PNP) Switch/Circuit | ||||||
| P0710/1208 | (3) A/T Fluid Temperature Sensor/Circuit | ||||||
| P0720/1102 | (3) Vehicle Speed Sensor/Circuit | ||||||
| P0725/1207 | (3) Engine Speed Signal | ||||||
| P0731/1103 | (3) Incorrect Shift To 1st Gear | ||||||
| P0732/1104 | (3) Incorrect Shift To 2nd Gear | ||||||
| P0733/1105 | (3) Incorrect Shift To 3rd Gear | ||||||
| P0734/1106 | (3) Incorrect Shift To 4th Gear | ||||||
| P0740/1204 | (3) TCC Solenoid/Circuit | ||||||
| P0744/1107 | (3) Torque Converter Clutch Function | ||||||
| P0745/1205 | (3) Line Pressure Solenoid/Circuit | ||||||
| P0750/1108 | (3) Shift Solenoid "A"/Circuit | ||||||
| P0755/1201 | (3) Shift Solenoid "B"/Circuit | ||||||
| P1105/1302 | MAP/BARO Solenoid/Circuit | ||||||
| P1110/0805 | Intake Valve Timing Control (IVTC)-Left Bank | ||||||
| P1120/0406 | Secondary TP Sensor/Circuit | ||||||
| P1125/0110 | Tandem TP Sensor/Circuit | ||||||
| P1135/1301 | Intake Valve Timing Control (IVTC)-Right Bank | ||||||
| P1140/1303 | IVTC Position Sensor-Left Bank | ||||||
| P1145/1304 | IVTC Position Sensor-Right Bank | ||||||
| P1148/0307 | Closed Loop Fault Detected-Left Bank | ||||||
| P1168/0308 | Closed Loop Fault Detected-Right Bank | ||||||
| P1210/0106 | Traction Control System Signal Circuit | ||||||
| P1220/1305 | Fuel Pump Control Module (FPCM)/Circuit | ||||||
| P1320/0201 | Ignition Signal | ||||||
| P1336/0905 | Crankshaft Position (CKP) Sensor | ||||||
| P1400/1005 | EGR Control Solenoid | ||||||
| P1401/0305 | EGR Temperature Sensor/Circuit | ||||||
| P1402/0514 | EGR Function (Open) | ||||||
| P1440/0213 | EVAP Small Leak (Positive Pressure) | ||||||
| P1444/0214 | EVAP Canister Purge Volume Control Valve | ||||||
| P1446/0215 | EVAP Canister Vent Control Valve (Close) | ||||||
| P1447/0111 | EVAP Purge Flow Monitor | ||||||
| P1448/0309 | EVAP Canister Vent Control Valve (Open) | ||||||
| P1490/0801 | Vacuum Cut Valve By-Pass Valve (Circuit) | ||||||
| P1491/0311 | Vacuum Cut Valve By-Pass Valve | ||||||
| P1492/0807 | EVAP Canister Purge Control Solenoid (Circuit) | ||||||
| P1493/0312 | EVAP Canister Purge Control Valve/Solenoid | ||||||
| P1605/0804 | A/T Diagnostic Communication Line | ||||||
| P1705/1206 | (3) A/T Temperature Sensor | ||||||
| P1706/1003 | Park/Neutral Position (PNP) Switch | ||||||
| P1760/1203 | (3) Overrunning Clutch Solenoid | ||||||
|
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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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