The Volvo B 4204 T38 is a 1,948 cc, inline‑four petrol engine produced between 2001 and 2004. It features a cast‑iron block, dual overhead camshafts (DOHC), and a Mitsubishi TD04 turbocharger with an air — to — air intercooler. This forced — induction unit delivered approximately 180 hp (132 kW) and 192 lb‑ft (260 Nm) of torque, offering enhanced performance for Volvo's compact executive models.
Fitted primarily to the Volvo S40 and V40 models, the B 4204 T38 was engineered f…
Production years 2001–2004 meet Euro 3 standards for applicable markets (VCA UK Type Approval not applicable for pre-1992 vehicles).
The Volvo B 4204 T38 is a 1,948 cc inline‑four petrol engine engineered for compact sedans and wagons (2001-2004). It combines a robust cast-iron block with a modern DOHC 16-valve valvetrain and timing belt to deliver turbocharged performance. Designed to meet Euro 3 emissions regulations, it incorporated catalytic converters and precise electronic fuel injection.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,948 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged with intercooler | |
Bore × stroke | 83.0 mm × 90.0 mm | |
Power output | 180 hp (132 kW) @ 5,500 rpm | |
Torque | 192 lb-ft (260 Nm) @ 1,800 rpm | |
Fuel system | Bosch Motronic 4.4 electronic fuel injection | |
Emissions standard | Euro 3 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Mitsubishi TD04 (air-to-air intercooler) | |
Timing system | Belt-driven dual overhead camshafts | |
Oil type | SAE 5W-30 (semi-synthetic) | |
Dry weight | 145 kg (est.) |
The Volvo B 4204 T38 was used across Volvo's S40 and V40 platforms with transverse mounting. This engine received no significant platform-specific adaptations between sedan and wagon variants, though turbocharger and intercooler piping layouts were identical. All applications are documented in OEM technical bulletins.
The B 4204 T38's primary reliability risk is turbocharger oil return line gasket failure, with elevated incidence in high-mileage or heat-soaked engines. Volvo service data indicates this was a frequent cause of oil leaks and turbo damage, while owner club surveys highlight ignition coil and timing belt issues as secondary concerns. Infrequent maintenance and neglect make regular inspection and adherence to OEM service intervals critical.
Analysis derived from Volvo technical bulletins (2001-2004) and Volvo Owners Club failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
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The B 4204 T38 can be reliable long-term if its critical maintenance, especially the 60,000-mile timing belt replacement and regular inspection of the turbo oil return line gasket, is strictly adhered to. Neglecting the gasket can lead to messy oil leaks and expensive turbo failure. With proper care, including regular oil changes and cooling system maintenance, these engines are known to last well beyond 150,000 miles.
The most critical issue is turbocharger oil return line gasket failure. Other common problems include ignition coil failure (especially on cylinders 1 and 4), timing belt failure leading to valve damage, and cooling system leaks. These are well-documented in Volvo service manuals and bulletins.
The B 4204 T38 was used exclusively in the performance-oriented T4 variants of the first-generation Volvo S40 (2001-2004) and V40 (2001-2004) models. It was never fitted to base models or later generations, which used larger 2.4L or 2.5L engines.
Yes. Common upgrades include installing a manual boost controller to increase boost pressure, upgrading the exhaust system, and performing an ECU remap. These can yield significant power gains (20-40 hp). More extensive tuning requires internal modifications like forged pistons to handle increased pressure.
Fuel economy is moderate for a turbocharged engine. Expect around 24-28 mpg (imperial) in mixed driving for an S40 T4. Highway cruising can yield up to 34 mpg, while city driving may drop to 20 mpg. Aggressive driving will significantly reduce fuel economy.
Yes. The Volvo B 4204 T38 is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe internal damage that often requires a complete engine rebuild or replacement.
Volvo originally specified SAE 5W-30 semi-synthetic oil. A good quality 5W-30 meeting ACEA A3/B3 or A3/B4 specifications is still recommended for these engines. For high-mileage engines, a high-mileage formulation can help condition seals and reduce oil consumption.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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