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.
2007 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - DTCS P0137 To P0448
- DTC P0137, P0157 Ho2S2
- 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 - P0308 Multiple Cylinder Misfire, No. 1 - 8 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
- DTC P0441 EVAP Control System
- DTC P0442 EVAP Control System
- DTC P0443 EVAP Canister Purge Volume Control Solenoid Valve
- DTC P0444, P0445 EVAP Canister Purge Volume Control Solenoid Valve
- DTC P0447 EVAP Canister Vent Control Valve
- DTC P0448 EVAP Canister Vent Control Valve
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.