The Volvo B 4204 T29 is a 1,999 cc, inline‑four petrol engine produced between 2007 and 2010. It features an aluminium block and head, dual overhead camshafts (DOHC), and a twin‑scroll turbocharger with Bosch ME7.0 electronic fuel injection. In standard tune for the S40/V50, it delivered approximately 125 kW (170 PS), offering a balance of performance and efficiency for Volvo's compact models.
Fitted primarily to the Volvo S40 and V50 (P1 platform), the B 4204 T29 was engi…
Production years 2007–2010 meet Euro 4 emissions standards (Swedish Transport Agency Type Approval Records).
The Volvo B 4204 T29 is a 1,999 cc inline‑four petrol engine engineered for compact hatchbacks and sedans (2007-2010). It combines a lightweight aluminium block with a DOHC valvetrain, turbocharging, and Bosch ME7.0 electronic fuel injection to deliver responsive, efficient power. Designed to meet Euro 4 emissions regulations, it balances everyday drivability with modern emissions control.
| 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 | 125 kW (170 PS) @ 5,000 rpm | |
Torque | 270 Nm @ 1,800 rpm | |
Fuel system | Bosch ME7.0 electronic fuel injection | |
Emissions standard | Euro 4 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Twin-scroll turbo (Mitsubishi TD04L-14T) | |
Timing system | Belt‑driven camshafts | |
Oil type | SAE 0W‑40 (Synthetic) | |
Dry weight | Not specified in available OEM docs |
The Volvo B 4204 T29 was used across Volvo's S40/V50 platforms with transverse mounting. This engine was part of the modular B4/B5 family and shared many components with the B5244T7 2.4L variant. Minor ECU and turbo revisions were implemented during its production run, but no major facelifts created significant interchange limits for core mechanical parts. All adaptations are documented in OEM technical bulletins.
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The B 4204 T29's primary long-term concern is failure of the electronic throttle body, typically occurring after 100,000 km. Volvo TSB-08-12 documented this as a cause of erratic idle, hesitation, and limp-home mode. Consistent operation and prompt replacement of the throttle body when symptoms appear are critical for preventing drivability issues.
Analysis derived from Volvo technical bulletins (2007-2011) and workshop manuals (2008). 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 B 4204 T29 can be reliable long-term if its critical maintenance items are strictly followed: replacing the timing belt every 100,000 km and addressing PCV system clogs. The electronic throttle body is its most common failure point after 100,000 km (TSB-08-12). With proper care and prompt attention to drivability symptoms, these engines can reach 200,000 km or more.
The most common issues are electronic throttle body failure causing erratic idle (TSB-08-12), timing belt failure due to missed replacement intervals, clogging of the PCV system leading to oil leaks, and oil leaks from turbo or crankshaft seals. These are well-documented in Volvo's service literature.
The B 4204 T29 was fitted exclusively to the first-generation Volvo S40 sedan and V50 wagon from 2007 to 2010. It was used in the T4 trim level, positioned between the naturally aspirated models and the higher-performance T5 variants.
Aftermarket ECU tuning is common on the B-4204-T29 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is moderate for its performance. Expect figures around 9-12 L/100km (23-31 mpg UK) in mixed driving for a well-maintained car. Economy is heavily influenced by driving style; aggressive driving will significantly increase consumption.
Yes. The Volvo B 4204 T29 is an interference engine. If the timing belt breaks or jumps, the pistons will contact the valves, causing severe internal damage that often requires a complete engine rebuild or replacement.
The engine requires SAE 0W-40 full synthetic oil meeting Volvo specification. This is critical for protecting the turbocharger and high-performance internals. Using the correct oil and adhering to 10,000 km change intervals is essential for longevity.
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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