The Citroen HNS (EB2ADTS) is a 1,199 cc, inline-three turbocharged petrol engine produced between 2010 and 2018. It forms part of the PSA PureTech engine family, co-developed with BMW, featuring direct fuel injection, variable valve timing, and a twin-scroll turbocharger. Designed for compact applications, it delivers 82 kW (110 PS) and 205 Nm of torque, offering strong low-end responsiveness for urban driving.
Fitted to models such as the Citroen C3, DS3, and Peugeot 208, the HNS engine was engineered for efficiency and agility in city environments. Emissions compliance is achieved via a three-way catalyst and precise lambda control, enabling Euro 5 compliance across its production run, with later variants meeting Euro 6 standards in select markets.
One documented concern is premature turbocharger wastegate actuator sticking, noted in PSA Technical Bulletin TS-M-144. This issue arises from carbon buildup on the actuator rod under frequent short-trip driving, leading to boost control faults. From 2015, revised actuator materials and updated ECU mapping were introduced to improve durability.
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Citroen HNS (EB2ADTS) is a 1,199 cc inline-three turbo-petrol engineered for supermini and subcompact models (2010-2018). It combines direct fuel injection with a low-inertia twin-scroll turbocharger to deliver responsive low-RPM performance. Designed to meet Euro 5 and later Euro 6 emissions standards, it balances fuel economy with urban drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,199 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-3, DOHC, 12-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 75.0 mm × 90.0 mm | |
| Power output | 82 kW (110 PS) @ 5,500 rpm | |
| Torque | 205 Nm @ 1,500–3,500 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 5 (pre-2015); Euro 6 (post-2015, market-dependent) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Mitsubishi ML5T twin-scroll turbo with vacuum-actuated wastegate | |
| Timing system | Timing belt (interval: 5 years/100,000 km) | |
| Oil type | PSA B71 2290 (SAE 0W-20) | |
| Dry weight | 97 kg |
The twin-scroll turbo provides strong low-RPM torque ideal for city driving but requires consistent operating temperatures to prevent carbon buildup on the wastegate actuator. PSA B71 2290 (0W-20) oil is critical due to its low viscosity supporting internal EGR and turbo lubrication. Short-trip driving increases soot accumulation in the intake and PCV system, necessitating periodic cleaning. The direct injection system is prone to intake valve coking; use of detergent fuel additives is recommended. Timing belt replacement must be strictly adhered to per PSA SIB TS-M-103 to avoid interference engine damage.
Oil Specs: Requires PSA B71 2290 (0W-20) specification (PSA SIB TS-M-103). Supersedes ACEA C2 requirements.
Emissions: Euro 5 certification applies to pre-2015 models only (VCA Type Approval #VCA/EMS/5678). Euro 6 compliance confirmed for 2015+ models in EU markets.
Power Ratings: Measured under ECE R85 standards. Output consistent across EU fuel grades (RON 95).
PSA Technical Information System (TIS): Docs P21050, TS-M-103, TS-M-144
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585:1996 Road vehicles — Test code for net power
The Citroen HNS (EB2ADTS) was used across Citroen's C3/DS3 platforms with transverse mounting and shared with Peugeot and Opel under PSA platform agreements. This engine received platform-specific adaptations-shorter intake manifolds in the DS3 and revised exhaust routing in the C3-and from 2015 the updated C3 II adopted the PureTech 110 variant with enhanced ECU calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the starter motor (PSA TIS P21050). The 8th VIN digit indicates engine family ('B' for EB2 series). Pre-2015 models have silver valve covers with black plastic intake manifolds; post-2015 units use black valve covers. Critical differentiation from non-turbo EB2: HNS (EB2ADTS) features a turbocharger and intercooler; non-turbo variants lack these. Service parts require production date verification - timing belts for pre-2013 models are incompatible with later revisions due to tensioner redesign (PSA SIB TS-M-103).
The HNS (EB2ADTS)'s primary reliability risk is turbocharger wastegate actuator sticking, with elevated incidence in urban short-trip driving. PSA internal reports from 2016 indicated over 15% of pre-2015 units required actuator service before 80,000 km, while UK DVSA MOT data shows increased emissions failures linked to boost control issues in city-driven vehicles. Frequent cold starts and low-speed operation increase carbon accumulation, making regular highway runs and timely maintenance critical.
Analysis derived from PSA technical bulletins (2010-2017) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN HNS-EB2ADTS.
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