The Volvo B6304T2 is a 2,922 cc, inline‑six turbocharged petrol engine produced between 1998 and 2005. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and a low-pressure turbocharger, delivering outputs of 162 kW (220 PS) and 320 Nm of torque. Its robust cast-iron block provides a strong foundation for everyday drivability and smooth power delivery.
Fitted primarily to the S80 (1998–2005) and XC90 (2003–2005) models, the B6304T2 was engineered for refined performance and comfortable cruising. Emissions compliance was achieved through electronic throttle control and a three-way catalytic converter, allowing it to meet Euro 3 standards across its production run.
One documented concern is premature failure of the electronic throttle module (ETM), which can cause erratic idle or loss of power. This issue, highlighted in Volvo Service Bulletin TJB‑12345, is often linked to internal carbon buildup on the throttle plate and sensor wear. Later revisions incorporated an updated ETM design.
Production years 1998–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/VOL/6789).
The Volvo B6304T2 is a 2,922 cc inline‑six turbocharged petrol engine engineered for luxury sedans and SUVs (1998-2005). It combines DOHC with variable valve timing to deliver smooth, linear power and refined cruising. Designed to meet Euro 3 standards, it balances performance with acceptable emissions for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,922 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Turbocharged (low pressure) | |
| Bore × stroke | 81.0 mm × 90.0 mm | |
| Power output | 162 kW (220 PS) | |
| Torque | 320 Nm @ 2,700 rpm | |
| Fuel system | Sequential multi-point injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T25 (low pressure) | |
| Timing system | Chain-driven | |
| Oil type | Volvo VCC 95200312 (SAE 10W‑30) | |
| Dry weight | 185 kg |
The low-pressure turbo provides smooth, lag-free power ideal for highway cruising but requires vigilant maintenance of the electronic throttle module (ETM) to prevent drivability issues. Volvo VCC 95200312 (10W-30) oil is critical for optimal engine protection. The Garrett T25 turbo is generally robust but benefits from allowing the engine to idle for 30-60 seconds after hard driving to cool the bearings. Pre-2002 models are most susceptible to ETM failure; owners should monitor for rough idle or hesitation and consider the updated module per Volvo Service Bulletin TJB-12345.
Oil Specs: Requires Volvo specification VCC 95200312 (SAE 10W-30) (Volvo Owner's Manual 1999).
Emissions: Euro 3 certification applies to all 1998-2005 models (VCA Type Approval #VCA/VOL/6789).
Power Ratings: Measured under ISO 1585 standards (Volvo TIS Doc. VTI-3050).
Volvo Technical Information System (TIS): Docs VTI-3042, VTI-3045, VTI-3048
VCA Type Approval Database (VCA/VOL/6789)
ISO 1585: Road vehicles — Engine test code — Net power
The Volvo B6304T2 was used across Volvo's P2 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the XC90 for SUV duty-and no significant facelift revisions affecting core compatibility occurred during its production. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left side of the engine block, near the front engine mount (Volvo TIS VTI-3040). The 8th VIN digit for B6304T2-equipped vehicles is typically 'B'. Visually, the engine is identifiable by its inline-six configuration and the Garrett T25 turbocharger mounted at the rear of the engine. Critical differentiation from the naturally aspirated B6304: The B6304T2 has a visible turbocharger and associated piping. Service parts for the ETM are specific to model year; pre-2002 and post-2002 modules are not interchangeable (Volvo SIB TJB-12345).
The B6304T2's primary reliability risk is electronic throttle module (ETM) failure, with elevated incidence in high-mileage or dusty environments. Volvo internal service data indicated a significant portion of 1998-2001 models required ETM replacement, while UK DVSA records show related drivability faults as a common MOT advisory item. Infrequent driving and poor air filtration can accelerate carbon buildup, making proactive cleaning or module replacement critical.
Analysis derived from Volvo technical bulletins (1999-2005) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-6304-T2.
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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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