The first-generation Mazda3 (code BK), launched in 2003 to replace the aging 323, marked a major turning point for the Japanese manufacturer. Based on Ford's excellent C1 platform (shared with the Ford Focus Mk2 and Volvo S40/V50), it immediately distinguished itself with its driving dynamics, precise steering, and exemplary gearbox control. Available as a 5-door hatchback and 4-door sedan, it received a facelift in late 2006, bringing slight aesthetic touches, improved sound insulation, a 6-speed manual gearbox on the 2.0 petrol, and especially a (slight) improvement in corrosion protection, which remains the Achilles' heel of this generation. While the petrol engines (MZR) are models of reliability, the diesel engines (MZ-CD), borrowed from PSA/Ford or developed in-house, have tarnished
The Mazda3 (BK) is a car with two faces. In its petrol version (1.6 or 2.0), it's an extremely reliable, fun-to-drive, and economical compact, representing an excellent used car purchase on a small budget. In its diesel version, particularly the 1.6 MZ-CD, it's a potential financial black hole to absolutely avoid. However, the real litmus test for buying any Mazda3 of this generation is corrosion. A meticulous inspection of the underbody and rear wheel arches is imperative before any purchase. If you find a healthy, rust-free petrol model (often those that have been garaged), go for it. Otherwise, move on.