2003 Infiniti QX4 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2003 Infiniti QX4

2003 Infiniti QX4 Problems

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 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.

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2003 Infiniti QX4 Questions

For tuneup, I'm buying 6 spark plugs and 6 coil - in boots. Do I need to also buy 6 ignition coils or just 1?

Code P1456 appears what does that mean

Service Engine Soon Light came on and it was checked by a local mechanic. He indicated that it was code P1456. He also told me it could be several different things and wanted to charge me lots of money to do diagnostics. What does code P1456 mean for this vehicle?

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2003 Infiniti QX4 Recalls

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.

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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