The 1990 model year was a pivotal moment in the life of the Mazda 323. It was this year that the 323 split into two separate models. The 323 was offered as a hatchback only, and the sedan went on to become the larger, more expensive Protege.

The 1990 323 was available in as the base and SE trims. Upgrading to the SE got cloth (instead of vinyl) upholstery, tinted glass, and an upgraded interior design. Both shared the same engine, a 1.6-liter, 82-horsepower, four-cylinder. A five-speed manual transmission was standard, with a four-speed automatic available as an option. Fuel economy is about 29/37.

Most 1990 323 owners like their cars because they are good little commuter cars that have excellent fuel efficiency and say that with scheduled maintenance, they are quite reliable. Many complain that they are pretty basic and lack many comfort features like A/C and supportive seats. Because they are inexpensive and easy to customize, 1990 Mazda 323s are popular among modification enthusiasts, who equip them with bigger engines and lots of flashy exterior extras.