Overview:
The B4204S is a naturally aspirated 1.9 L (1,948 cc) inline-four petrol engine—marketed by Volvo as a 2.0 L—and was produced between 1995 and 2000. It powered the first-generation Volvo S40 and V40, providing a balanced mix of performance and efficiency.

Key Specifications:

• Configuration: Naturally aspirated, 16-valve inline-4

• Displacement: 1.948 L (commonly referred to as 2.0 L)

• Power Output: Approximately 140 PS (103 kW) at 6,000 rpm

• Torque: Around 183 Nm at 4,500 rpm

• Compression Ratio: 10.5:1

• Engine Management: Siemens Fenix 5.1

Applications:

• Volvo S40 I (1995–2000), badged as S40 2.0

• Volvo V40 I (1995–2000), similarly badged

Additional Options:
There were also variants like the B4204S2, which added variable valve timing (VVT), as well as turbocharged versions (B4204T, T2, T3, T4, and T5) offering higher outputs and torque.