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.
1998 Infiniti QX4FACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes 3.3L
- Description & Operation
- Connector Identification
- Diagnostic Tests
- DTC Identification
- DTC P0100: Mass Airflow (MAF) Sensor
- DTC P0105: Absolute Pressure (AP) Sensor
- DTC P0110: Intake Air Temperature (IAT) Sensor
- DTC P0115: Engine Coolant Temperature (ECT) Sensor
- DTC P0120: Throttle Position (TP) Sensor
- DTC P0125: Engine Coolant Temperature (ECT) Sensor
- DTC P0130 Or P0150: Front Heated Oxygen Sensor (Ho2S) Circuit
- DTC P0131 Or P0151: Front Heated Oxygen Sensor (Ho2S) Lean Shift
- DTC P0132 Or P0152: Front Heated Oxygen Sensor (Ho2S) Rich Shift
- DTC P0133 Or P0153: Front Heated Oxygen Sensor (Ho2S) Response Monitoring
- DTC P0134 Or P0154: Front Heated Oxygen Sensor (Ho2S) High Voltage
- DTC P0135 Or P0155: Front Heated Oxygen Sensor (Ho2S) Heater
- DTC P0137 Or P0157: Rear Heated Oxygen Sensor (Ho2S) Minimum Voltage
- DTC P0138 Or P0158: Rear Heated Oxygen Sensor (Ho2S) Maximum Voltage
- DTC P0139 Or P0159: Rear Heated Oxygen Sensor (Ho2S) Response Monitoring
- DTC P0140 Or P0160: Rear Heated Oxygen Sensor (Ho2S) High Voltage
- DTC P0141 Or P0161: Rear Heated Oxygen Sensor (Ho2S) Heater
- DTC P0171 Or P0174: Fuel Injection System Function Lean
- DTC P0172 Or P0175: Fuel Injection System Function Rich
- DTC P0180: Tank Fuel Temperature (TFT) Sensor
- DTCS P0300-P0306: Cylinder Or Multiple Cylinder Misfire
- DTC P0325: Knock Sensor (KS)
- DTC P0335 Or P1336: Crankshaft Position (CKP) Sensor
- DTC P0340: Camshaft Position (CMP) Sensor
- DTC P0400: EGR Function
- DTC P0402: EGR Control BACKPRESSURE Transducer (EGRC-BPT) Valve
- DTC P0420 Or P0430: 3-Way Catalyst Function
- DTC P0440: Evaporative Emission (EVAP) Control System Leak
- DTC P0443: EVAP Canister Purge Volume Control Solenoid Valve
- DTC P0446: EVAP Canister Vent Control Valve (Ca Models)
- DTC P0450: EVAP Control System Pressure Sensor
- DTC P0500: Vehicle Speed Sensor (VSS)
- DTC P0505: Idle Air Control (IAC)
- DTC P0510: Closed Throttle Position Switch
- DTC P0600: A/T Control
- DTC P0605: Pcm
- DTC P1105: Manifold Absolute Pressure (Map)/Barometric Pressure (BARO) Solenoid
- DTC P1148 Or P1168: Closed Loop Control
- DTC P1320: Ignition Signal
- DTC P1336: Crankshaft Position (CKP) Sensor
- DTC P1400: EGR Control (EGRC) Solenoid
- DTC P1401: EGR Temperature Sensor
- DTC P1402: EGR Function (Open)
- DTC P1440: Evaporative Emission (EVAP) Control System Leak
- DTC P1444: EVAP Canister Purge Volume Control Valve
- DTC P1446 Or P1448: EVAP Canister Vent Control Valve
- DTC P1447: EVAP System Purge Flow Monitoring
- DTC P1490 Or P1491: Vacuum Cut By-Pass Valve
- DTC P1605: A/T Diagnosis Communication Line
- DTC P1706: Park/Neutral Position 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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