The Dacia H4B 408 is a 1,000 cc, inline — three, turbocharged petrol engine produced between 2018 and 2023. Developed by Renault as part of the H — Type engine family, it features a cast — iron block, aluminium head, and multi — point fuel injection (MPFI) with a turbocharger. It delivers 73 kW (100 PS) at 5,500 rpm and 160 Nm of torque between 2,000–3,000 rpm, offering improved performance over naturally aspirated predecessors. The design prioritises compactness and efficie…
All production years (2018–2023) comply with Euro 6d-TEMP standards .
The Dacia H4B 408 is a 1,000 cc inline-three turbocharged petrol engine designed for compact and crossover vehicles (2018–2023). It combines turbocharging with multi-point fuel injection to deliver strong low-RPM torque and improved fuel efficiency. Engineered to meet Euro 6d-TEMP emissions standards, it balances performance and environmental compliance for urban applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 999 cc | |
Fuel type | Petrol (Unleaded, 95 RON min) | |
Configuration | Inline-3, DOHC, 12-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 75.0 mm × 75.0 mm | |
Power output | 73 kW (100 PS) @ 5,500 rpm | |
Torque | 160 Nm @ 2,000–3,000 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | BorgWarner KP35 (integrated exhaust manifold) | |
Timing system | Rubber timing belt (interval: 120,000 km or 6 years) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 92 kg |
The Dacia H4B 408 was used across Dacia's L90/J90/B90 platforms with transverse mounting and shared with Renault for badge-engineered variants. This engine received platform-specific tuning—slightly higher boost in the Duster and revised torque delivery in the Sandero Stepway—and from 2020 the updated tensioner design improved timing belt reliability, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
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The H4B 408's primary reliability risk is timing belt failure on early builds, with elevated incidence in hot climates and extended service cycles. Renault internal reports from 2021 indicated a significant share of pre-2020 engines required belt replacement before 100,000 km, while VCA data links timing-related failures to neglected maintenance in fleet-operated vehicles. High ambient temperatures and infrequent full-load operation increase belt and tensioner stress, making adherence to replacement intervals critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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Yes, the H4B 408 is fundamentally reliable when maintained properly. Early models (2018–2019) are prone to timing belt tensioner failure if not serviced on time. Post-2020 revisions improved durability. Regular oil changes, timely belt replacement (every 120,000 km or 6 years), and use of quality coolant significantly extend engine life. It's known for mechanical simplicity and good urban performance, though turbo components require attention.
The main issues are timing belt tensioner failure (especially pre-2020), turbo boost control faults due to actuator or hose wear, coolant leaks from the water pump, and ignition coil degradation. These are documented in Renault service bulletins. The MPFI system is robust, but spark plugs and coils require periodic replacement. Preventive maintenance greatly reduces failure rates.
The H4B 408 was used in the Dacia Sandero (2018–2023), Logan (2018–2023), and Duster (2018–2023). It was also installed in the Renault Clio (2019–2023). All applications are 1.0L TCe petrol variants. All models meet Euro 6d-TEMP emissions standards as verified under VCA / Manufacturer Specification.
Limited tuning potential exists. ECU remaps are available and can yield +15–20 PS gains due to conservative factory tuning. However, the stock turbo and fuel system limit higher outputs. Air intake and exhaust modifications offer minor improvements. Forced induction upgrades are not practical. Modifications should be approached cautiously to avoid reliability trade-offs on this economy-focused powertrain.
Official figures show 5.2–5.8 L/100km (54–49 mpg UK) in mixed driving. Real-world consumption typically ranges from 6.0–7.5 L/100km (47–38 mpg UK), depending on driving style and conditions. The Sandero achieves slightly better economy than the Duster due to lower weight. Urban driving may see higher consumption due to turbo spool and frequent gear changes.
Yes. The H4B 408 is an interference engine. If the timing belt fails, the pistons can contact the open valves, causing severe internal damage. This makes strict adherence to the 120,000 km or 6-year replacement interval absolutely critical. Any signs of belt wear or tensioner noise should prompt immediate inspection.
Renault specifies SAE 5W-30 oil meeting ACEA C3 standards. Suitable API SN/CF oils are acceptable. Change intervals are 15,000 km or 1 year. Using correct viscosity and quality ensures proper lubrication for the turbocharger and timing system. Avoid thicker oils in cold climates and always use low-ash oil to protect emissions components.
Comprehensive technical documentation and regulatory references
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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
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Type-approval guidance and documentation.
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