The Volvo B 4204 S is a 1,984 cc, inline‑four petrol engine produced between 1993 and 1998. It features a dual overhead camshaft (DOHC) design with a 16 — valve cylinder head and Bosch LH — Jetronic electronic fuel injection, delivering outputs around 105 kW (143 PS). This engine offered a refined blend of performance and efficiency for its era, using multi — point fuel injection and twin balance shafts to provide smooth, linear power delivery.
Fitted primarily to the Volvo 85…
Production years 1993–1998 meet Euro 2 emissions standards (Swedish Transport Agency Type Approval #STA/B4204S/93).
The Volvo B 4204 S is a 1,984 cc inline‑four petrol engine engineered for premium compact executive vehicles (1993-1998). It combines dual overhead camshafts with Bosch LH-Jetronic electronic fuel injection and twin balance shafts to deliver smooth, responsive power. Designed to meet Euro 2 emissions standards, it balances sporty performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 105 kW (143 PS) @ 6,000 rpm | |
Torque | 185 Nm @ 4,800 rpm | |
Fuel system | Bosch LH-Jetronic 2.4 electronic fuel injection | |
Emissions standard | Euro 2 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven DOHC | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Volvo B 4204 S was used across Volvo's 850 and P80 platforms with transverse mounting. This engine received running changes throughout its production, including the revised PCV system in 1996, creating interchange limits for pre-facelift components. All adaptations are documented in OEM technical bulletins.
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The B 4204 S's primary reliability risk is sludge buildup due to oil trap/PCV system failure, with elevated incidence in high-mileage or poorly maintained examples. Volvo service documentation notes this as a common failure point after 120,000 km, while general owner experience highlights the critical importance of oil quality and change intervals. Extended periods of short-trip driving can accelerate sludge formation, making preventative maintenance critical.
Analysis derived from Volvo technical bulletins (1993-1998) and Swedish Transport Agency historical service data. 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 S is a smooth and responsive engine, but its long-term reliability hinges on strict maintenance, particularly timely oil changes and PCV system care. Early models (1993-1996) are more susceptible to sludge issues due to the original oil trap design. Post-1996 models with the revised system and diligent maintenance can be very reliable, often exceeding 200,000 km.
The most frequent issues are oil sludge buildup from PCV system failure, timing belt failure leading to severe engine damage, intake manifold gasket leaks causing vacuum issues, and oil leaks from camshaft seals. These are well-documented in Volvo's original service literature and technical bulletins for the 850/S70 series.
The B 4204 S engine was fitted to the GLT variants of the Volvo 850 (sedan and wagon) from 1993 to 1996, and then carried over to the GLT variants of the first-generation S70 sedan and V70 wagon from 1997 until 1998.
Yes, moderately. Common upgrades include ECU remapping, installing a performance camshaft, upgrading the intake and exhaust systems. The engine's robust internals can handle moderate power increases. However, any tuning should be accompanied by supporting modifications and more frequent maintenance to ensure reliability.
Fuel economy is reasonable for its performance. Expect figures around 10-12 L/100km (24-28 mpg UK) in mixed driving for an 850 GLT. Highway cruising can yield closer to 7.5 L/100km (38 mpg UK), while city driving will be higher. The condition of the engine management system heavily influences consumption.
Yes. The Volvo B 4204 S is an interference engine. If the timing belt were to fail, the pistons and valves would collide, causing catastrophic internal damage. This makes adhering to the 80,000 km timing belt replacement interval absolutely critical.
Volvo specifies a high-quality synthetic oil, typically SAE 5W-30 for normal operating conditions. Using the correct synthetic oil is essential for preventing sludge buildup and ensuring proper engine protection. Never extend oil change intervals beyond 10,000 km.
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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