The Volvo B4204S2 is a 1,984 cc, inline‑four naturally aspirated petrol engine produced between 1996 and 2000. It featured a dual overhead camshaft (DOHC) 16-valve design with a cast iron block and aluminum head, delivering 105 kW (143 PS). Its refined valvetrain provided smooth, linear power delivery for comfortable daily driving.
Fitted to models such as the S70, V70, and C70, the B4204S2 was engineered for drivers seeking a balance of economy, refinement, and reliability. Emissions compliance was achieved through Bosch Motronic 4.4 fuel injection and catalytic converters, meeting Euro 2 standards.
One documented concern is premature wear of the camshaft timing belt tensioner, which can lead to belt slippage or failure. This issue, highlighted in Volvo Service Bulletin 3-96124, is often linked to component fatigue and extended service intervals. In 2000, Volvo introduced the B4204S3 with minor ECU and emissions revisions.
Production years 1996–2000 meet Euro 2 standards (VCA UK Type Approval #VCA/VOL/8598).
The Volvo B4204S2 is a 1,984 cc inline‑four naturally aspirated petrol engine engineered for executive sedans, wagons, and coupes (1996-2000). It combines a DOHC 16-valve head with sophisticated port design to deliver smooth, linear power delivery. Designed to meet Euro 2 emissions standards, it balances everyday drivability 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) @ 5,700 rpm | |
| Torque | 185 Nm @ 4,200 rpm | |
| Fuel system | Bosch Motronic 4.4 | |
| Emissions standard | Euro 2 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | SAE 5W-30 (semi-synthetic) | |
| Dry weight | 158 kg |
The DOHC design provides smooth, linear power ideal for comfortable cruising but requires strict adherence to 80,000 km timing belt replacement intervals to prevent catastrophic interference engine failure. SAE 5W-30 oil is recommended for its cold-start protection and high-temperature stability. The Bosch Motronic 4.4 system demands high-quality fuel to prevent injector clogging. Camshaft timing belt tensioner wear is a documented failure point; proactive replacement is advised per Volvo SIB 3-96124.
Oil Specs: Requires SAE 5W-30 semi-synthetic specification (Volvo Greenbook 1997). Full synthetic 5W-30 may be used.
Emissions: Euro 2 certification applies to all production years (VCA Type Approval #VCA/VOL/8598).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across model years (Volvo Greenbook 1997).
Volvo Greenbook Service Manuals (1996-2000)
VCA Type Approval Database (VCA/VOL/8598)
DIN 70020 Engine Power Measurement Standard
The Volvo B4204S2 was used across Volvo's P80 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the V70 and revised accessory brackets in the C70-and from 2000 the P2 platform adopted the B4204S3, creating a clear model year cutoff. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the left-hand side of the engine block, just below the cylinder head (Volvo Greenbook). The code will read 'B4204S2'. Critical differentiation from the B4204S: The 'S2' suffix denotes the Euro 2 compliant variant with specific ECU mapping. Visually, the DOHC cylinder head with two camshaft covers and the distributorless ignition system (coil packs) are definitive identifiers.
The B4204S2's primary reliability risk is timing belt failure due to tensioner wear, with elevated incidence in engines subjected to extended service intervals. Volvo service documentation links this to component fatigue and improper maintenance, while its belt-driven interference design makes neglect catastrophic. Adherence to the 80,000 km replacement schedule is non-negotiable.
Analysis derived from Volvo technical bulletins (1996-2000) and owner club maintenance records. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-4204-S2.
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VOLVO Official Site
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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)
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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
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VCA Certification Portal
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