The 2.0-liter Ford YS4E, also known as the Split Port 2.0 engine, was manufactured in Michigan between 2000 and 2004 and was exclusively fitted to the initial iteration of the well-liked Focus model in the United States. Because so many cars with the motor have been exported, it has become widely used in many other nations.

The Split Port line also includes internal combustion engines: F8CE.
The engine was installed on:
- Ford Focus USA Mk1 in 2000 – 2004.
Specifications
| Production years | 2000-2004 |
| Displacement, cc | 1988 |
| Fuel system | distributed injection |
| Power output, hp | 111 |
| Torque output, Nm | 169 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 84.8 |
| Piston stroke, mm | 88 |
| Compression ratio | 9.4 |
| Features | CVH |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.8 |
| Fuel type | petrol |
| Euro standards | EURO 3 |
| Fuel consumption, L/100 km (for Ford Focus 2000) — city — highway — combined |
11.1 6.5 8.2 |
| Engine lifespan, km | ~240 000 |
Disadvantages of the YS4E engine
The valve seats falling into the cylinders is the only worldwide engine issue;
The new cylinder head is therefore the most sought-after node for this motor;
Other than that, the engine is incredibly dependable; the valve does not bend even if the timing belt breaks;
The majority of owner complaints are about expensive parts and noisy operation; many drivers have also reported oil or coolant leaks.
