The Volvo B 4204 S3 is a 1,948 cc, inline‑four petrol engine produced between 1999 and 2004. It features a cast‑iron block, dual overhead camshafts (DOHC), and a variable intake manifold with drive — by — wire throttle. This naturally aspirated unit delivered approximately 140 hp (103 kW) and 133 lb‑ft (180 Nm) of torque, offering refined performance for Volvo's compact executive models.
Fitted primarily to the Volvo S40 and V40 models, the B 4204 S3 was engineered for smoot…
Production years 1999–2004 meet Euro 3 standards for applicable markets applicable for pre-1992 vehicles).
The Volvo B 4204 S3 is a 1,948 cc inline‑four petrol engine engineered for compact sedans and wagons (1999-2004). It combines a robust cast-iron block with a modern DOHC 16-valve valvetrain and timing belt to deliver smooth, linear power. Designed to meet Euro 3 emissions regulations, it incorporated catalytic converters and precise electronic fuel injection.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,948 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 90.0 mm | |
Power output | 140 hp (103 kW) @ 6,000 rpm | |
Torque | 133 lb-ft (180 Nm) @ 4,500 rpm | |
Fuel system | Bosch Motronic 4.4 electronic fuel injection | |
Emissions standard | Euro 3 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven dual overhead camshafts | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 140 kg (est.) |
The Volvo B 4204 S3 was used across Volvo's S40 and V40 platforms with transverse mounting. This engine received no significant platform-specific adaptations between sedan and wagon variants, though intake manifold and exhaust layouts were identical. All applications are documented in OEM technical bulletins.
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The B 4204 S3's primary reliability risk is variable intake manifold actuator failure, with elevated incidence in high-mileage or damp-condition vehicles. Volvo service data indicates this was a frequent cause of drivability complaints, while owner club surveys highlight timing belt and ignition coil issues as secondary concerns. Infrequent maintenance and neglect make regular inspection and adherence to OEM service intervals critical.
Analysis derived from Volvo technical bulletins (1999-2004) and Volvo Owners Club failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The B 4204 S3 can be reliable long-term if its critical maintenance, especially the 60,000-mile timing belt replacement and inspection of the variable intake manifold system, is strictly adhered to. With proper care, including regular oil changes and cooling system maintenance, these engines are known to last well beyond 150,000 miles.
The most critical issue is variable intake manifold actuator failure. Other common problems include timing belt failure leading to valve damage, ignition coil failure, and cooling system leaks. These are well-documented in Volvo service manuals and bulletins.
The B 4204 S3 was used in the naturally aspirated 1.9i variants of the first-generation Volvo S40 (1999-2004) and V40 (1999-2004) models. It was never fitted to turbocharged variants or later generations, which used different engine codes.
Yes. Common upgrades include installing a performance camshaft, larger throttle body, free-flow exhaust, and performing an ECU remap. These can yield moderate power gains. More extensive tuning requires internal modifications like higher compression pistons.
Fuel economy is good for a naturally aspirated engine. Expect around 26-30 mpg (imperial) in mixed driving for an S40 1.9i. Highway cruising can yield up to 36 mpg, while city driving may drop to 22 mpg. Economy is heavily influenced by driving style and the condition of the fuel injection system.
Yes. The Volvo B 4204 S3 is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe internal damage that often requires a complete engine rebuild or replacement.
Volvo originally specified SAE 5W-30 semi-synthetic oil. A good quality 5W-30 meeting ACEA A3/B3 or A3/B4 specifications is still recommended for these engines. For high-mileage engines, a high-mileage formulation can help condition seals and reduce oil consumption.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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