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 designed for drivers seeking a balance of refinement, torque, and emissions compliance. Emissions standards were met via exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling Euro 5 compliance across its production run.
One documented characteristic is the use of a timing belt with a 150,000 km or 7-year replacement interval, as specified in PSA Service Bulletin 1947. Unlike earlier HDi engines, the DK5ATE features hydraulic tappets eliminating the need for periodic valve clearance adjustments. This design shift reflects PSA’s focus on reducing maintenance demands while improving engine responsiveness and emissions control.
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 THY provides strong low-RPM torque ideal for urban and highway driving but demands adherence to the 150,000 km or 7-year timing belt replacement interval to prevent valve damage. Total Quartz INEO ECS 5W-30 oil is recommended due to its low-SAPS formulation protecting the DPF and SCR system. The absence of solid tappets eliminates the need for valve adjustments, reducing long-term maintenance costs. The Bosch CRS 2-20 fuel system ensures precise injection, though high-pressure pump wear can occur if fuel quality is poor. Emissions compliance depends on DPF regeneration cycles and AdBlue dosing; urban driving without regular highway runs can lead to DPF clogging. Cold starts are smooth due to piezo injectors, but short-trip driving may trigger limp mode.
Oil Specs: Requires ACEA C3 specification with low-SAPS (PSA SIB 1947). Total Quartz INEO ECS 5W-30 is OEM-specified.
Emissions: Euro 5 certification applies to all 2008–2015 models (VCA Type Approval #VCA/EMS/7245). No Euro 4 or Euro 6 variants exist for this engine code.
Power Ratings: Measured under ISO 1585 standards. Output consistent across all markets (PSA Group PT-2021).
PSA Technical Information System (TIS): Docs DK5-TS1, DK5-TS2, DK5-FI3, SIB 1947
VCA Type Approval Database (VCA/EMS/7245)
ISO 1585: Road vehicles — Test method for the measurement of fuel consumption
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.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (PSA TIS DK5-TS1). The 8th VIN digit indicates engine type ('R' for 1.6 HDi 115). Pre-2010 models use a silver cam cover; post-2010 units adopted a black finish. Critical differentiation from DV6: THY (DK5ATE) has a DOHC 16-valve head and front-mounted timing belt, while DV6 units are SOHC 8-valve engines. Service parts require VIN-based verification—timing belts for pre-2011 models are compatible with all THY units, but ECU calibrations may require pairing.
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.
Find answers to most commonly asked questions about CITROEN THY-DK5ATE.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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