Which Honda model was the company's first four-door sedan?

Honda’s first four-door sedan was the Honda 1300.

Introduced in Japan in 1969, the Honda 1300 was a front-wheel-drive compact car powered by a 1,298 cc air-cooled four-cylinder engine. It was offered initially as a four-door sedan, with a two-door coupé joining the range in 1970. The model was Honda’s largest automobile up to that point and marked a major step beyond the company’s earlier small cars and sports models.

The 1300 was an ambitious and technically unusual project. Soichiro Honda strongly favored air cooling, leading engineers to develop the Duo Dyna Air Cooling system, which used a double-wall engine design and fans to manage heat. Production and development were difficult, and the car was relatively expensive compared with rivals such as the Toyota Corolla and Nissan Bluebird.

The Honda Life and Civic followed soon afterward, and lessons from the 1300 helped shape Honda’s later passenger cars. The Civic was not Honda’s first four-door sedan; it arrived in 1972, after the 1300 had already established that format for the company.