The 1.8-liter Ford C9DA, C9DB, C9DC, or 1.8 Endura-DI engine was built between 1999 and 2004 and fitted both before and after the Focus model’s initial redesign. Unlike several of its predecessors, this unit has gained widespread use.

RTP and BHDA internal combustion engines are also part of the Endura-DI line.
The engine was installed on:
- Ford Focus Mk1 in 1999 – 2004.
Specifications
| Production years | 1999-2004 |
| Displacement, cc | 1753 |
| Fuel system | direct injection |
| Power output, hp | 90 |
| Torque output, Nm | 200 |
| Cylinder block | cast iron R4 |
| Block head | cast iron 8v |
| Cylinder bore, mm | 82.5 |
| Piston stroke, mm | 82 |
| Compression ratio | 19.4 |
| Features | intercooler |
| Hydraulic lifters | no |
| Timing drive | chain and belt |
| Phase regulator | no |
| Turbocharging | yes |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.75 |
| Fuel type | diesel |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for Ford Focus 2001) — city — highway — combined |
7.1 4.2 5.4 |
| Engine lifespan, km | ~300 000 |
Disadvantages of the C9DA/C9DB/C9DC engine
Unlike its predecessors, this diesel engine can run for a long time with high-quality fuel;
The efficiency of high-pressure fuel pumps and injectors is rapidly impacted by low-quality diesel fuel;
A seriously clogged fuel filter is typically the cause of abrupt traction failures;
The intersection of the cylinder block’s upper and lower sections is frequently where lubrication leaks occur;
Examining the intercooler air duct’s corrugations is worthwhile if the engine is unstable.
