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2001 Infiniti QX4 Problems

Check Engine Light With Code P0138, P0140, P0158, and/or P0160

for the Infiniti QX4

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.

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The 4WD Light May Flash On and Off Intermittently

for the Infiniti QX4

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.

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Abnormal Noise From Timing Chain Area

for the Infiniti QX4

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.

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Check Engine Light Due to Failed Rear Oxygen Sensor

for the Infiniti QX4

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.

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