The Citroën HMU (EB2D) is a 1,199 cc, inline-three naturally aspirated petrol engine produced between 2009 and 2016. It belongs to the PSA EB engine family, designed for compact urban vehicles with a focus on lightweight efficiency and emissions compliance. Featuring a cast-iron block, aluminium head, and multi-point fuel injection (MPFI), it delivers modest power with excellent fuel economy. In standard tune, it produces 54 kW (73 PS) and 118 Nm of torque.
Fitted to models such as the Citroën C3, C1, and DS3, as well as the Peugeot 108 and 208, the EB2D was engineered for city driving practicality and low running costs. It prioritizes fuel efficiency and ease of servicing over performance, making it ideal for first-time drivers and urban commuting. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, meeting Euro 5 standards throughout its production run.
One documented concern is inlet manifold air leaks due to degraded plastic connectors, particularly in high-mileage or thermally stressed units. This issue, referenced in PSA Service Bulletin SIB-ENG-2012-03, can cause unstable idle and poor fuel metering. From 2012, revised nylon-reinforced connectors were introduced to improve longevity, reducing the incidence of vacuum leaks in later production runs.
Production years 2009–2016 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/8765).
The Citroën HMU (EB2D) is a 1,199 cc inline-three naturally aspirated petrol engine designed for compact urban vehicles (2009–2016). It combines modern architecture with proven reliability, using a belt-driven DOHC valvetrain and sequential multi-point injection. Designed to meet Euro 5 standards, it balances fuel economy with acceptable performance for city driving.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,199 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-3, DOHC, 12-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 75.0 mm × 90.0 mm | |
| Power output | 54 kW (73 PS) @ 6,000 rpm | |
| Torque | 118 Nm @ 3,000 rpm | |
| Fuel system | Magneti Marelli MPI (sequential multi-point injection) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (interval: 90,000 km or 6 years) | |
| Oil type | Total Multis 5W-30 | |
| Dry weight | 92 kg |
The naturally aspirated inline-three design provides lightweight efficiency ideal for city driving but requires adherence to 90,000 km timing belt intervals to prevent valve/piston contact. Total Multis 5W-30 oil is recommended for thermal stability in high-load conditions. The engine is sensitive to inlet vacuum leaks; post-2012 reinforced connectors reduce cracking risk. Fuel economy is excellent in urban cycles (~5.0 L/100km), but performance diminishes on longer journeys. Catalytic converter longevity depends on consistent use of 95 RON fuel and proper lambda sensor function. Regular valve clearance checks are advised to maintain performance and reduce noise.
Oil Specs: Requires Total Multis 5W-30 or equivalent meeting PSA B71 2290. Supersedes ACEA A5/B5.
Emissions: Euro 5 certification applies to all models (2009–2016) (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under ECE R85 standards. Output requires 95 RON fuel for optimal combustion (PSA TIS EB-ENG-04).
PSA Technical Information System (TIS): Docs EB-ENG-01, EB-FUEL-02, SIB-ENG-2012-03
VCA Type Approval Database (VCA/EMS/8765)
ISO 8854: Road vehicles — European emissions standards
The Citroën HMU (EB2D) was used across Citroën's A/B-segment platforms with transverse mounting and shared with Peugeot under the EB engine program. This engine received platform-specific calibrations-adapted idle control in the C1 and revised exhaust routing in the DS3-and from 2012 the facelifted C3 II adopted updated intake connectors and ECU mapping, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the transmission bellhousing (PSA TIS EB-ENG-05). The 8th VIN digit indicates engine type ('U' for EB2D). Pre-2012 models have black plastic intake manifolds with standard vacuum lines; post-2012 units feature reinforced nylon connectors. Critical differentiation: EB2D uses a DOHC 12-valve head with belt-driven camshaft, while the older TU3A uses a SOHC 6-valve configuration. Service parts require model-year verification—ECUs and oxygen sensors from pre- and post-2012 builds are not interchangeable (PSA SIB-ENG-2012-03).
The EB2D's primary reliability risk is inlet manifold air leaks on high-mileage or thermally stressed units, with elevated incidence in older models. PSA internal quality reports from 2014 indicated a significant number of pre-2012 units requiring manifold connector replacement before 120,000 km, while UK DVSA MOT records show increased emissions-related failures in urban-driven examples. Extended service intervals and coolant neglect accelerate degradation, making service adherence and component quality critical.
Analysis derived from PSA technical bulletins (2012–2016) and UK DVSA failure statistics (2014–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN HMU-EB2D.
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