|Also called||Nissan Terrano Regulus (Japan)|
|Body and chassis|
|Body style||5-door SUV|
|Layout||Front engine, rear-wheel drive / four-wheel drive|
|Engine||VG33E 3.3 L V6
VQ35DE 3.5 L V6
|Wheelbase||2,700 mm (106.3 in)|
|Length||1997-2000: 4,671 mm (183.9 in)
2001–2003: 4,651 mm (183.1 in)
|Width||1,839 mm (72.4 in)|
|Height||1,796 mm (70.7 in)|
The Infiniti QX4 is a mid-size luxury sport utility vehicle (SUV) introduced in 1996 and based on the unibody Nissan Pathfinder. It was released following Acura's introduction of the SLX and Lexus's larger LX 450. The QX4 was Infiniti's first entry into the SUV market segment.
In the North American market, it was marketed as the "Infiniti QX4" while in Japan it was sold as the Nissan Terrano Regulus. Major differences between these vehicles and the Pathfinder include a more upscale interior, and unique styling. Although marketed as a luxury vehicle, it has good off-road capability due to its low-range four-wheel-drive system and 8.3 inches (211 mm) of ground clearance.
The QX4 received its first major update in 2000, with a new VQ series engine (also later seen in the G35 and FX35) increasing its power from a relatively low 168 horsepower (125 kW) to a 240 hp (179 kW) V6 engine. The displacement went from 3.3 L to 3.5 L. The timing belt was replaced with a timing chain and the ignition distributor was replaced with an individual coil ignition system.
This facelift also gave the QX4 an updated exterior and interior body style, including features such as a new dash with integrated analog clock, 17-inch (423 mm) alloy wheels and xenon HID headlamps. In Japan, the Terrano Regulus trim package was no longer offered. Also, a rear-wheel drive model was added (1997 through 2000 were only available in 4WD).
2002 Infiniti QX: Cruise control designed to maintain a set distance from other traffic was the main addition for 2002. The QX4 shared Nissan's Intelligent Cruise Control with Infiniti's flagship Q45 sedan. Employing laser sensors, the system was designed to automatically speed or slow the QX4 to keep it a constant distance from cars ahead. Also new for 2002 was a revised audio system, plus audio controls for the available leather/wood steering wheel. The optional rear-seat video entertainment system offered a choice of VCR or DVD player.
2003 Infiniti QX: Additional standard equipment for 2003 included curtain-type side airbags, available for the first time. Several new standard features had previously been part of the Premium Package, including 17-inch wheels, a driver-seat memory system, and a leather/woodgrain steering wheel with audio controls. Options included heated front/rear seats and a videotape or DVD rear-seat entertainment system, as well as a power moonroof.
As of model year 2002, the Regulus was no longer available in Japan.
The QX4 was discontinued in 2003, and its position in price was taken by the FX35/45 crossover SUV. The last QX4 was manufactured during November 2002. The QX4 was succeeded by the larger QX56 in 2004.