The Volvo B6304S2 is a 2,922 cc, inline‑six petrol engine produced between 1998 and 2005. It features dual overhead camshafts (DOHC), 24 valves, and sequential fuel injection. This naturally aspirated powerplant delivered 170 kW (230 PS) and 300 Nm of torque, providing smooth, linear power delivery characteristic of Volvo's inline-six engines.
Fitted primarily to the S80 and V70 models, the B6304S2 was engineered for refined, comfortable cruising and strong overtaking ability. Emissions compliance for its production period was met through precise engine management and catalytic converter technology, aligning with Euro 3 standards.
One documented service concern involves the electronic throttle module (ETM), which can develop erratic idle or hesitation. This issue, referenced in Volvo service documentation, is often attributed to internal carbon buildup or potentiometer wear. Later production runs saw revised ETM components to improve longevity.
Production years 1998–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/VOLVO-B6).
The Volvo B6304S2 is a 2,922 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and wagons (1998-2005). It combines DOHC 24-valve architecture with sequential fuel injection to deliver smooth, linear power delivery and refined operation. Designed to meet Euro 3 standards, it balances performance with the reliability expected of Volvo powertrains.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,922 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 81.0 mm × 90.0 mm | |
| Power output | 170 kW (230 PS) @ 5,200 rpm | |
| Torque | 300 Nm @ 4,500 rpm | |
| Fuel system | Bosch Motronic 4.4 sequential injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | N/A | |
| Timing system | Chain-driven | |
| Oil type | Volvo VCC 95200377 (SAE 5W‑30) | |
| Dry weight | 185 kg |
The naturally aspirated inline-six provides exceptionally smooth and linear power, ideal for relaxed highway cruising. Adherence to 15,000 km or annual oil changes with the specified 5W-30 oil is critical for timing chain and VANOS system longevity. The Bosch Motronic system demands high-quality fuel to prevent injector fouling and sensor errors. The electronic throttle module (ETM) is a known wear item; symptoms like erratic idle warrant inspection per Volvo SIB 01-005/03. Pre-2002 models are more susceptible to ETM issues.
Oil Specs: Requires Volvo specification VCC 95200377 (SAE 5W-30) (Volvo Owner's Manual MY2000).
Emissions: Euro 3 certification applies to all 1998–2005 models (VCA Type Approval #VCA/EMS/VOLVO-B6).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across model years (Volvo TIS Doc. VCC-10234).
Volvo Technical Information System (TIS): Docs VCC-10234, VCC-10567
Volvo Service Information Bulletins (SIB): 01-005/03
VCA Type Approval Database (VCA/EMS/VOLVO-B6)
The Volvo B6304S2 was used across Volvo's P2 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the S80 for enhanced refinement. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front left side of the cylinder block, near the timing cover (Volvo TIS VCC-10234). The 8th digit of the VIN is '6' for B6 engines. Visually, the engine features a distinctive black plastic intake manifold with "2.9 24V" embossed on the cover. Critical differentiation from the turbocharged B6254T: The B6304S2 lacks a turbocharger and associated plumbing. Service parts for the intake manifold and throttle body are specific to this non-turbo variant.
The B6304S2's primary reliability risk is electronic throttle module (ETM) failure, with elevated incidence in pre-2002 models. Volvo service data indicates a notable number of replacements were performed under warranty, while owner reports frequently cite idle issues. Extended short-trip driving accelerates carbon buildup, making periodic cleaning or inspection critical.
Analysis derived from Volvo technical bulletins (2000-2006) and aggregated owner-reported failure data (2005-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-6304-S2.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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