The Japanese carmaker has sold more than 5m of the nameplate since it was first launched and the company says the latest changes give the car a substantial boost in refinement.
The diesel engines gain a sharper response, and quieter operation thanks to technologies like sound frequency control.
Extra soundproofing materials and improved seals have further trimmed noise levels, while changes to the suspension have upgraded the ride experience.
There have also been revisions to the instrumentation for improved readability.
Pedestrian detection in cars equipped with advanced safety technologies has also been extended in distance and operating speed.
The 2017 Mazda3 range will start at €23,295 and the car is now available, ready for order for the 171 plate change.
