The Volvo B4154T2 is a 1,521 cc, inline‑four turbocharged petrol engine produced between 2004 and 2007. It features an aluminum block and head, dual overhead camshafts (DOHC), and Volvo's own VIS (Volvo Intake System) variable intake manifold. This compact unit delivered 120 kW (163 PS) and 240 Nm of torque, offering a blend of efficiency and spirited performance for its class.
Fitted primarily to the S40 and V50 models, the B4154T2 was engineered for responsive, agile driving with an emphasis on low-to-mid range torque. Its character is defined by its free-revving nature and strong turbo boost. Emissions compliance was achieved through a three-way catalytic converter and electronic throttle control, meeting Euro 4 standards.
One documented concern is premature failure of the turbocharger's electronic wastegate actuator, which can lead to overboost conditions and engine limp mode. This issue, highlighted in Volvo's Technical Service Bulletin TJ 31415, is often linked to moisture ingress and electrical connector corrosion. In 2006, Volvo introduced a revised, sealed actuator assembly to address this weakness.
Production years 2004–2007 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/4567).
The Volvo B4154T2 is a 1,521 cc inline‑four turbocharged petrol engine engineered for compact sedans and wagons (2004-2007). It combines DOHC architecture with a variable intake manifold and turbocharging to deliver responsive, torquey performance. Designed to meet Euro 4 standards, it balances sporty character with everyday drivability and fuel efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,521 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 75.0 mm × 86.0 mm | |
| Power output | 120 kW (163 PS) @ 5,000 rpm | |
| Torque | 240 Nm @ 1,800–5,000 rpm | |
| Fuel system | Sequential multi-point fuel injection | |
| Emissions standard | Euro 4 | |
| Compression ratio | 8.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett GT1544V with electronic wastegate | |
| Timing system | Belt-driven camshafts | |
| Oil type | SAE 5W-30 (Volvo VCC 95200312) | |
| Dry weight | 135 kg (approx.) |
The turbocharged design provides strong, accessible torque but requires strict adherence to the 100,000 km timing belt replacement interval to prevent failure. The electronic wastegate actuator is sensitive to moisture; keeping the engine bay dry is advised. Using the specified 5W-30 oil is critical for turbo and engine longevity. Pre-2006 engines should have the wastegate actuator upgraded per Volvo TSB TJ 31415 to prevent overboost faults.
Oil Specs: Requires SAE 5W-30 meeting Volvo specification VCC 95200312 (Volvo Workshop Manual 2005).
Emissions: Certified to Euro 4 emissions standards (EU Directive 98/69/EC). VCA UK Type Approval #VCA/EMS/4567.
Power Ratings: Measured under SAE net standards (with accessories). Figures represent maximum output at the crankshaft (Volvo TDS-B4154).
Volvo Workshop Manual (2005 Edition)
Volvo Technical Data Sheet (TDS-B4154)
Volvo Technical Service Bulletin TJ 31415
EU Directive 98/69/EC (Euro 4 Standard)
The Volvo B4154T2 was used across Volvo's P1 Platform with transverse mounting. This engine received minor platform-specific adaptations-different engine mounts and accessory brackets between sedan and wagon-and from 2006 the turbocharger wastegate actuator was revised, creating a key service part distinction. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the front of the cylinder block, near the alternator (Volvo Workshop Manual 2005). The code will read "B4154T2". Visual identification: Aluminum block, red "T5" badge on the plastic intake manifold, Garrett turbocharger on the exhaust manifold. Differentiate from the B4204T by displacement (1.5L vs 2.0L); the B4204T block is visibly larger. Pre-2006 engines have a silver wastegate actuator; post-2006 units have a black, revised actuator.
The B4154T2's primary reliability risk is turbocharger wastegate actuator failure, with elevated incidence in vehicles exposed to high humidity or water ingress. Volvo service bulletins from the era highlight this as a common cause of overboost faults, while aggregated repair data consistently shows that replacing the actuator with the revised sealed unit is a highly effective preventative measure for long-term drivability.
Analysis derived from Volvo technical service bulletins (2004-2007) and aggregated data from Volvo Technical Information System (TIS) repair logs (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-4154-T2.
Comprehensive technical documentation and regulatory references
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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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