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-capable handling, leveraging a twin-scroll turbocharger for minimal lag and maximum boost efficiency. Emissions compliance was managed through Bosch ME7.0 electronic fuel injection and catalytic converters, meeting Euro 4 standards for its production era.
One documented service consideration is the susceptibility of the turbocharger's electronic wastegate actuator to premature failure due to heat cycling, potentially leading to overboost conditions and engine damage, as noted in Volvo Service Bulletin #SB-04-45. The engine was eventually superseded by the B4204T5 variant with revised actuator design.
Production years 2004–2007 meet Euro 4 emissions standards (VCA UK Type Approval applicable 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 twin-scroll turbo provides explosive, lag-free power ideal for track use but requires a 90-second idle cooldown after hard driving to prevent oil coking and actuator failure. SAE 0W-40 full-synthetic oil is mandatory for its extreme high-temperature stability. The 8.5:1 compression ratio demands premium high-octane fuel (RON 98). Strict 100,000 km timing belt replacement is mandatory. The electronic wastegate actuator is a critical failure point and should be inspected regularly.
Oil Specs: Requires SAE 0W-40 full-synthetic specification (Volvo Owner's Manual 2005). ACEA A3/B4 or equivalent is mandatory.
Emissions: Certified to Euro 4 standards for all production years (2004-2007) (VCA UK Type Approval applicable for registered imports).
Power Ratings: Measured under SAE net horsepower standards (post-1972). Output is specific to the B4204T9 'T5' variant (Volvo Workshop Manual 2004).
Volvo Workshop Manual (2004 Edition)
Volvo Owner's Manual (2005)
Volvo EPC Archive: Doc. VEP-4204T9-04
Volvo Service Bulletin #SB-04-45
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.
Locate the engine code stamped on the flat pad atop the block, near the gearbox flange on the firewall side (Volvo Workshop Manual 2004). The casting number for the B4204T9 block is 'B4204'. Visual identification: Features a DOHC valve cover, Bosch ME7.0 ECU, a prominent Mitsubishi TD04HL twin-scroll turbocharger, and a "T5" badge on the rear of the vehicle. Differentiate from the lower-powered B4204T5 by its unique turbocharger and higher boost pressure mapping.
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.
Find answers to most commonly asked questions about VOLVO B-4204-T9.
Comprehensive technical documentation and regulatory references
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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)
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
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