The first and second generations of the well-liked compact model under the index 2 were equipped with the 1.4-liter Mazda Y4 or 1.4 CiTD diesel engine, which was manufactured between 2003 and 2009. This unit, which is a variant of the Peugeot 1.4 HDi engine, is available in one version of the Y404.

Diesel engines are also part of the Y-ENGINE family: Y6.
The engine was mounted on:
- Mazda 2 DY in 2003 – 2007;
- Mazda 2 DE in 2007 – 2009.
Specifications
| Production years | 2003-2009 |
| Displacement, cc | 1399 |
| Fuel system | Common Rail |
| Power output, hp | 68 |
| Torque output, Nm | 160 |
| Cylinder block | aluminum R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 73.7 |
| Piston stroke, mm | 82 |
| Compression ratio | 17.9 |
| Features | SOHC |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | BorgWarner KP35 |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.75 |
| Fuel type | diesel |
| Euro standards | EURO 3/4 |
| Fuel consumption, L/100 km (for Mazda 2 2008) — city — highway — combined |
5.1 3.5 4.1 |
| Engine lifespan, km | ~300 000 |
Disadvantages of the Y4 1.4 CiTD engine
This diesel engine is quite inventive despite its small displacement;
Although the Siemens fuel system is dependable, it is terrified of airing;
Additionally, the high pressure fuel pump’s PCV and VCV control valves frequently malfunction here;
Keep a close eye on the timing belt’s condition because if it breaks, the valves will bend. The engine’s crankshaft damper pulley and crankcase ventilation membrane are also weak points.
