The Volvo B4204T9 is a 1,999 cc, inline‑four turbocharged petrol engine produced between 2004 and 2007. It features a cast iron block, aluminum head, and dual overhead camshafts (DOHC) driven by a timing belt. This high — performance engine was engineered for Volvo's compact executive models, delivering exhilarating power with refined turbo response.
Fitted primarily to the Volvo S40 and V50 T5 models, the B4204T9 was designed for spirited acceleration and track — capa…
Production years 2004–2007 meet Euro 4 emissions standards for registered imports).
The Volvo B4204T9 is a 1,999 cc inline‑four turbocharged petrol engine engineered for high-performance compact sedans and wagons (2004-2007). It combines a dual overhead camshaft design with a twin-scroll turbocharger and Bosch ME7.0 fuel injection to deliver explosive, linear power. Designed to meet Euro 4 emissions standards, it prioritizes driver engagement and track-ready performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,999 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 162 kW (220 PS) | |
Torque | 320 Nm @ 2,000 rpm | |
Fuel system | Bosch ME7.0 electronic fuel injection | |
Emissions standard | Euro 4 | |
Compression ratio | 8.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Mitsubishi TD04HL-15T twin-scroll | |
Timing system | Toothed belt (interference design) | |
Oil type | SAE 0W-40 (Full-Synthetic) | |
Dry weight | 140 kg |
The Volvo B4204T9 was used across Volvo's S40/V50 T5 platform with transverse mounting. This engine received specific ECU, turbocharger, and intercooler tuning for the T5 performance variant, creating distinct power characteristics. All adaptations are documented in OEM technical bulletins.
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The B4204T9's primary reliability risk is premature failure of the turbocharger's electronic wastegate actuator due to extreme heat cycling. Volvo service data from the mid-2000s indicates this was a frequent cause of warranty claims, particularly in vehicles used for track days or aggressive driving without adhering to cooldown procedures. Strict adherence to operating procedures and preventative maintenance is critical to avoid costly engine damage.
Analysis derived from Volvo technical bulletins (2004-2007) and workshop manuals (2004-2006). 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 B4204T9 can be reliable long-term, but its turbocharger system, particularly the wastegate actuator, is its primary vulnerability. With meticulous care, including strict adherence to cooldown procedures, using mandatory full-synthetic oil, timely replacement of the timing belt, and proactive actuator inspection, it can provide many years of exhilarating performance. Neglect will lead to expensive repairs.
The most critical issues are turbocharger wastegate actuator failure, timing belt failure, and high-pressure fuel pump failure. Oil leaks from camshaft seals are also common. These are all well-documented in Volvo's original service literature and can be managed with preventative maintenance and strict adherence to operating procedures.
The B4204T9 was used exclusively in the high-performance T5 variants of the second-generation Volvo S40 sedan and V50 wagon from 2004 to 2007. It was the flagship petrol engine for these compact models, offering near-sports car levels of performance.
Yes, it responds exceptionally well to tuning. Common upgrades include ECU remapping, fitting an aftermarket boost controller, upgrading the exhaust system, and installing a larger intercooler. Significant gains are possible while retaining reliability, provided supporting modifications and strict maintenance schedules are followed.
Fuel economy is poor due to its high performance. Expect around 10.5-12.5 L/100km (22-26 mpg UK) in mixed driving for an S40 or V50 T5. Economy is heavily influenced by driving style; aggressive use of boost will significantly increase consumption, while gentle driving can yield slightly better figures.
Yes. The Volvo B4204T9 is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe internal damage that requires a major engine rebuild. This makes the 100,000 km timing belt replacement schedule absolutely critical.
Volvo mandates SAE 0W-40 full-synthetic oil meeting ACEA A3/B4 or equivalent specifications. This is non-negotiable for protecting the engine under high-stress conditions. Using lower-grade oil will accelerate wear and lead to premature failure of critical components.
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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