Infiniti QX4 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Infiniti QX4

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Infiniti QX4 Problems

The 4WD Light May Flash On and Off Intermittently

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/Infiniti  approved fluid is present in the transfer case if this condition occurs.

Timing Chain Rattle and Tapping Noise

Rattling and tapping in the front of the engine on the 2001-2004 Infiniti QX4 is very evident, especially on cold starts. This rattling noise should not be taken lightly as it warns of upcoming timing chain failure. 

The cause of the noise is faulty timing chain guide rails and timing chain tensioners that wear out well ahead of schedule. These components are there to keep the timing chain tight and properly positioned. When these parts fail, the timing chain becomes loose, and pieces of the timing chain guides break off, falling into the oil pan. 

To remedy the situation, Nissan/Infiniti has made revised guides and tensioners, but replacement can be very costly. 

Proper oil change intervals and oil type may help slow or prevent the situation. 

Erratic or High Idle After Cleaning Throttle Body

The throttle body for the Infiniti QX4 is known for carbon buildup, and requires regular, light cleaning to maintain peak performance. After cleaning the throttle body, many owners notice a very high idle, erratic (bouncing) idle, and unpredictable power surging. 

The cause is normal ECU adaptation: When the throttle body builds up carbon, the rate of airflow is slightly decreased. The vehicles computer reads this decrease in air volume, and adjusts the throttle body settings to maintain the proper engine idle speed. When the carbon is cleaned out, the ECU now registers too much air, and cannot adjust back to the original settings. While it is trying to change settings, the idle will bounce from low to high, and the car will surge forward at times. 

It has been recommended to simply wipe inside the throttle body every 12,000 miles, and never to touch the flap inside. Also, the cleaning procedure may be best left to a qualified technician.

The solution can be as simple as disconnecting the battery for at least an hour, having the dealer reset the computer, or, in extreme cases, replace the throttle bodies. 

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Infiniti QX4 Questions

When locked all of sudden alarm going off. Have to keep unlocked. N stalls (1 answer)

Stalls intermittent. Like running out of gas.. Smell ordor

Battery installed wrong. Replaced fuses/main fuse. Still won't start. (1 answer)

Replaced alternator. Couldn't get it to boost off. When trying a different battery, it was installed wrong. Blew fuses/ replaced them. Still won't start. And trying to boost it off blows main fuse again.

vehicle does nothing when you turn the key. no dome lite, no anything. clicking (1 answer)

clicking noise under the hood from fuse box. any information would help tremendously. thank you

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Infiniti QX4 Recalls

Front Airbag Inflator Module

This limited regional recall is for vehicles currently registered or first sold in Florida, Puerto Rico, Hawaii and the U.S. Virgin Islands, and equipped with Takata-brand air bag inflators. Upon deployment the driver and/or passenger airbag inflator could rupture, increasing the risk of personal injury. Honda dealers will replace the affected airbag inflator modules to correct this concern.

Injury Due to Airbag Deployment

Airbags use a chemical reaction contained in an inflator module to create the pressure necessary to inflate the bags when deployment is required. These vehicles are being recalled because the front passenger airbag inflator may produce excessive internal pressure when deployed. As a result, the inflator module could rupture, causing metal fragments to strike vehicle occupants. Dealers will inspect and replace any defective passenger front airbag inflator modules found.

Rust May Form on the Strut Tower Housing

In areas where winter road salt is used, a mixture of snow/water and salt may enter an assembly location hole in the upper strut housing. This corrosive mixture can collect on the mating surface of the strut housing panel and the inner hood ledge assembly; over time, this can cause rusting of the strut tower housing. The rust can weaken the housing, causing it to crack and pull away from the inner hood ledge assembly. This can lead to grinding noises and increased steering effort, which, if severe enough, can cause the steering column to break. This would result in a loss of steering control, increasing the risk of a crash. Dealers will inspect the strut housing and repair the vehicles as necessary. An interim notification letter should be mailed to owners prior to May 16, 2011.

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Infiniti QX4 Reviews

I bought my 2003 Infiniti QX4 used, but it was well maintained, and I kept it that way with regular service. It was almost at 221,000 miles (it drove beautifully, with no problems at all). I was hoping to keep it forever (even as a weekend car), but I was hit by another car in an accident and totalled it out. I actually cried, because I drove this vehicle 50 plus miles every day to work, and en...
I love my infiniti qx4 2002. This is my second one! It is quite expensive to maintain but it's worth the expense. Presently it's been diagnosed with po420 catalytic converter problem....my heart is sad....but still love my baby. Wish they did not discontinue the model. It is a very durable vehicle. I once saw 450,000 mileage accrued from QX4 4WD. It was still running, I fell in love....
My QX4 Infinity has been giving me nothing but problem it's a 2001 the code pc160/code 300 multipy misfire 02 sensor / right cataylac converter.is this car worth the cost of repair?

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