The base models of the first generation S40 model and the comparable V40 station wagon were equipped with the 1.6-liter Volvo B4164S2 gasoline engine, which was manufactured in Sweden between 1999 and 2004. A phase regulator was a distinguishing feature of this power unit, which took the place of the B4164S motor.

B4164S, B4164S2, B4184S, B4184S2, and B4194T are members of the 2.0-liter modular engine family.
The engine was mounted on:
- Volvo S40 I (644) in 1999 – 2004;
- Volvo V40 I (645) in 1999 – 2004.
Specifications
| Production years | 1999-2004 |
| Displacement, cc | 1587 |
| Fuel system | injector |
| Power output, hp | 109 |
| Torque output, Nm | 145 |
| Cylinder block | aluminum R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 81 |
| Piston stroke, mm | 77 |
| Compression ratio | 10.3 |
| Features | DOHC |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | yes |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.4 |
| Fuel type | petrol |
| Euro standards | EURO 3 |
| Fuel consumption, L/100 km (for Volvo V40 2002) — city — highway — combined |
10.6 6.0 7.7 |
| Engine lifespan, km | ~320 000 |
Disadvantages of the B4164S2 engine
Leaks from clogged crankcase ventilation are the primary cause of engine issues.
The timing belt’s life is shortened when oil seeps through the camshaft seals;
Additionally, a damaged ribbed belt may enter the timing, which could be fatal for the engine;
This motor’s intake shaft had a phase regulator that wasn’t very dependable;
The camshaft position sensor’s rotor and the pump are the unit’s weak points.
