The Check Engine Light may illuminate with code P0138, P0140, P0158, and/or P0160 stored. Our technicians recommend replacing the rear oxygen sensor, and reprogramming the vehicle's powertrain control module (PCM) with upgraded software to correct this concern.
Infiniti QX4 Problem Reports
RepairPal Verified Infiniti QX4 Problem Reports
The Check Engine Light may illuminate indicating a fault with two or more oxygen sensors. Our technicians tell us this may be caused by a poor ground between the cylinder head and the exhaust manifold.
The mass airflow sensor may fail resulting in a loss of power and/or Check Engine Light illumination with code P0171 and/or P0174 stored. Our technicians recommend replacing the failed airflow sensor to correct this concern.
The heater blower motor may only work on the high speed setting. Our technicians recommend replacing the heater blower motor and fan control amplifier to address this problem.
Front catalytic converters are prone to cracking along the seams of the converter itself. Most repair shops can successfully weld the seems to prevent exhaust leakage.
The rear oxygen sensor may fail resulting in illumination of the Check Engine Light. Our technicians recommend to ensure the latest software is installed in the powertrain control module (PCM) along with replacing the failed O2 sensor.
The 4WD light may flash on and off intermittently with no transfer case related fault code stored in the powertrain control module (PCM). Our technicians recommend to ensure the correct Nissan/Infinity approved fluid is present in the transfer case if this condition occurs.
An abnormal noise may develop from the timing chain area, Our technicians tell us it may be necessary to replace the variable valve timing camshaft shaft sprockets to correct this concern.
Failure of the EVAP System charcoal canister may allow charcoal debris to infiltrate the EVAP system causing other failures. Cleaning the vapor lines to ensure the system is clear of debris is important when repairing EVAP system failures.
Carbon deposits on the throttle body may cause any of the following issues: Idle speed fluctuation, incorrect idle speed, difficulty accelerating way from a stop, and or increased accelerator pedal resistance. Our technicians tell us a revised throttle body and associated parts are available to resolve this issue.
The Check Engine Light may illuminate with throttle position switch fault codes stored. Our technicians tell us a revised throttle position switch is available to correct this concern.