The Nissan Altima saw a few changes for the 2003 model year, despite the fact that it had just been redesigned the previous year, including some new option packages and faux wood and titanium accents in some models.

The 2003 Altima came in four trims: the base model, the midrange S, the plush SL, and the top-of-the-line SE. The SE came standard with a 3.5-liter, 240-horsepower V6, and the others had a 2.5-liter, 175-horsepower four cylinder engine. All models came with a folding rear seat, power doors, and a tilting steering wheel. Upgrading to the S got air conditioning, cruise control, remote keyless entry, and a CD player. The SL included a power driver's seat and an upgraded sound system. Upgrading to the SE got the bigger engine, foglamps, and bigger wheels.

The Altima is Nissan's best-selling vehicle, and drivers like it because it is a good value and is very reliable. Owners also praise its good looks and ample trunk space. Some drivers complain about the front seats, and others caution that in the event that the car does need repairs, parts and labor can be expensive.