The Citroen HNP (EB2ADT) is a 1,199 cc, inline-three turbocharged petrol engine produced between 2018 and 2023. It forms part of the PSA Group’s EB family of small-displacement, high-efficiency engines, co-developed with Toyota. Featuring direct injection (THP), a twin-scroll turbocharger, and variable valve timing, it delivers responsive urban performance with strong low-end torque for everyday drivability. Output ranges from 95 kW (130 PS) to 110 kW (150 PS), depending on tune.
Fitted to models such as the C3, C4, and C5 Aircross, the HNP engine was engineered for compact and subcompact applications emphasizing fuel economy, low emissions, and agile city driving. Emissions compliance was achieved through a gasoline particulate filter (GPF), exhaust gas recirculation (EGR), and a three-way catalytic converter, enabling Euro 6d-TEMP compliance across its production run. Its compact size and transverse mounting support efficient cabin packaging.
One documented concern is premature turbocharger wastegate actuator sticking, noted in PSA Technical Service Bulletin TSB-ENG-2021-08. This issue arises from carbon buildup and thermal fatigue in high-heat zones, leading to boost control faults. From 2020, revised actuator hardware and updated ECU mapping were implemented to improve reliability and reduce DPF regeneration frequency.
All production years 2018–2023 meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/5678).
The Citroen HNP (EB2ADT) is a 1,199 cc inline-three turbocharged petrol engine engineered for compact and subcompact models (2018–2023). It combines direct fuel injection with a twin-scroll turbocharger to deliver responsive low-RPM torque and efficient urban performance. Designed to meet Euro 6d-TEMP standards, it balances everyday drivability with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,199 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-3, DOHC, 12-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 75.0 mm × 90.0 mm | |
| Power output | 95–110 kW (130–150 PS) | |
| Torque | 230–250 Nm @ 1,750–3,000 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Mitsubishi MHK2 twin-scroll turbo with vacuum-actuated wastegate | |
| Timing system | Timing chain (front-mounted) | |
| Oil type | PSA B71 2290 (SAE 0W-20) | |
| Dry weight | 108 kg |
The twin-scroll turbo provides strong low-RPM torque ideal for city driving but requires consistent operating temperatures to prevent carbon buildup in the EGR and intake tract. PSA B71 2290 (0W-20) oil is critical due to its low viscosity formulation protecting the high-pressure fuel pump and turbo bearings. Extended short-trip driving increases GPF clogging risk, necessitating periodic highway runs to trigger passive regeneration. The Bosch HDEV5 fuel system demands TOP TIER petrol to prevent injector fouling. Post-2020 models feature revised wastegate actuators; pre-2020 units should be checked for free movement per PSA TSB-ENG-2021-08. EGR valve cleaning is recommended every 60,000 km to maintain performance.
Oil Specs: Requires PSA B71 2290 (0W-20) specification (PSA TSB-ENG-2019-05). Supersedes ACEA C2 requirements.
Emissions: Euro 6d-TEMP certification applies to all models 2018–2023 (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ECE R85 standards. 110 kW output requires 98 RON fuel (PSA TIS Doc. EB-PWR-150).
PSA Technical Information System (TIS): Docs EB-FAM-001, EB-TURBO-02, EB-TIM-01, TSB-ENG-2021-08
VCA Type Approval Database (VCA/EMS/5678)
ISO 8854:2020 Road vehicles — Light vehicles with compression-ignition engines — Gaseous emissions test procedures
The Citroen HNP (EB2ADT) was used across Citroen's C3/C4 platforms with transverse mounting and shared with Peugeot, Opel, and Toyota under joint development agreements. This engine received platform-specific adaptations-shorter intake manifolds in the C3 and revised torque mounts in the C5 Aircross-and from 2020 the facelifted C4 models adopted the HNP Evolution variant with updated ECU calibration and GPF monitoring, creating interchange limits. Partnerships allowed Toyota's D-4S 1.2L units to share common-rail injection components. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing cover (PSA TIS EB-ID-001). The 8th VIN digit indicates engine type ('H' for HNP series). Pre-2020 models have silver valve covers with ribbed plastic timing covers; post-2020 units use gloss black valve covers. Critical differentiation from EB2DT: Original HNP (EB2ADT) uses Bosch HDEV5 injectors with green seals, while EB2DT uses Continental units with black seals. Service parts require production date verification - turbo actuators for pre-2020 models are incompatible with post-2020 revisions due to linkage redesign (PSA TSB-ENG-2021-08).
The HNP (EB2ADT)'s primary reliability risk is turbocharger wastegate actuator sticking, with elevated incidence in urban driving with frequent cold starts. PSA internal field reports from 2022 indicated a notable share of pre-2020 units required actuator service before 80,000 km, while UK DVSA records show increased GPF-related emissions failures in stop-start conditions. Short-trip driving and low-quality fuel exacerbate carbon accumulation, making fuel quality and driving pattern awareness critical.
Analysis derived from PSA technical bulletins (2018-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN HNP-EB2ADT.
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