The Citroën THY, internally designated DK5ATE, is a 1,560 cc, inline — four turbo — diesel engine produced between 2008 and 2015. It belongs to the PSA DV/DK engine family, featuring a DOHC 16 — valve configuration and high — pressure common — rail direct injection. Delivering 84 kW (115 PS), it was engineered for responsive mid — range performance and improved fuel efficiency over earlier HDi units.
Fitted to models such as the C4, C4 Picasso, and C5, the THY (DK5ATE) was desig…
All production years 2008–2015 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/7245).
The Citroën THY (DK5ATE) is a 1,560 cc inline-four turbo-diesel engine designed for compact and mid-size passenger vehicles (2008–2015). It features a 16-valve DOHC valvetrain and common-rail injection to deliver smooth power delivery and improved fuel efficiency. Engineered to meet Euro 5 standards, it balances drivability with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,560 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 75.0 mm × 88.3 mm | |
Power output | 84 kW (115 PS) @ 4,000 rpm | |
Torque | 270 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CRS 2-20 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 16.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Garrett GT1544V variable geometry turbo (VGT) | |
Timing system | Timing belt (DOHC, front-mounted) | |
Oil type | Total Quartz INEO ECS 5W-30 (ACEA C3) | |
Dry weight | 148 kg |
The Citroën THY (DK5ATE) was used across Citroën's C4/C5 platforms with transverse mounting and shared with Peugeot under internal PSA engineering agreements. This engine received model-specific calibrations-adapted EGR flow rates in the C4 Picasso and revised intake manifolds in the C5-and from 2011 the updated SCR control module created service part distinctions. All adaptations are documented in OEM technical bulletins.
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The THY (DK5ATE)'s primary reliability risk is DPF clogging due to urban driving cycles, with elevated incidence in high-mileage applications. PSA internal reports from 2013 noted increased DPF regeneration failures in units exceeding 120,000 km without highway runs, while UK DVSA records show emissions-related faults as a leading cause of MOT failure for pre-2016 diesel engines. Extended oil change intervals and poor fuel quality accelerate wear, making adherence to maintenance schedules critical.
Analysis derived from PSA technical bulletins (2008-2015) and UK DVSA failure statistics (2010-2020). 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 THY (DK5ATE) is mechanically robust when maintained properly. Its DOHC 16-valve design and common-rail injection improve refinement over older HDi units. However, strict adherence to the 150,000 km or 7-year timing belt replacement is essential to prevent engine damage. DPF health depends on driving style—regular highway runs are critical. With correct oil changes and AdBlue maintenance, these engines can exceed 250,000 km.
Key issues include DPF clogging due to urban driving, timing belt failure if intervals are missed, EGR valve coking, and AdBlue system faults. These are well-documented in PSA service bulletins. Using incorrect oil or extended service intervals increases risk of premature DPF and turbo failure. Regular highway driving helps maintain DPF regeneration cycles.
The THY (DK5ATE) 1.6 HDi 115 was used in the Citroën C4 (2008–2013), C4 Picasso (2008–2015), and C5 (2008–2012). It was also shared with the Peugeot 308. All applications meet Euro 5 emissions standards. The engine is identifiable by its 16-valve DOHC layout and front-mounted timing belt. It replaced the older DV6 engine in PSA's lineup.
Yes, but with limitations. ECU remaps can increase output to around 140–150 PS safely, as the Bosch CRS 2-20 fuel system and VGT turbo have headroom. However, exceeding this risks DPF overload and reliability. Supporting mods like upgraded intercooler and exhaust improve results. Tuning should use reputable firms familiar with Euro 5 emissions constraints.
Excellent for its class. In a Citroën C4 1.6 HDi 115, expect ~5.4 L/100km (city), ~4.2 L/100km (highway), or approximately 52 mpg UK combined. Real-world consumption typically ranges from 48–58 mpg UK depending on driving style. Its low-end torque and efficient combustion make it well-suited for mixed driving.
Yes. The THY (DK5ATE) is an interference engine. If the timing belt fails or jumps, the pistons can collide with open valves, causing bent valves or piston damage. This makes strict adherence to the 150,000 km or 7-year replacement interval absolutely critical. Any signs of belt wear or tensioner failure should be addressed immediately.
PSA specifies a low-SAPS 5W-30 oil meeting ACEA C3 standards, such as Total Quartz INEO ECS 5W-30. This protects the DPF, SCR, and turbo from ash buildup. Oil must be changed every 15,000 km or 12 months to ensure proper lubrication and prevent soot-related wear. Using non-C3 oil can lead to DPF blockage and costly repairs.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
CITROEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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