The Peugeot THY (DK5ATE) is a 1,587 cc, inline‑four naturally aspirated petrol engine produced between 1998 and 2004. It features a cast iron block, aluminium head, and double overhead camshafts (DOHC) with 16 valves. This unit delivered 66 kW (90 PS) and 135 Nm of torque, offering a balance of urban agility and fuel-efficient cruising.
Fitted to models such as the Peugeot 206, 306, and Citroën Saxo and Xsara, the THY was engineered for responsive, economical driving in compact hatchbacks and saloons. Its design prioritised low-end torque and refinement. Emissions compliance for most units was achieved to meet Euro 2 standards through multi-point fuel injection and catalytic converter technology.
One documented concern is premature wear of the exhaust camshaft lobes, particularly in high-mileage examples, as noted in Peugeot Technical Note 9812 A. This wear can lead to reduced performance and misfires. The issue is often attributed to marginal lubrication quality and extended service intervals under certain driving conditions.
Production years 1998–2004 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/1011).
The Peugeot THY (DK5ATE) is a 1,587 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and saloons (1998-2004). It combines multi-point fuel injection with DOHC 16-valve architecture to deliver responsive low-to-mid range performance. Designed to meet Euro 2 standards, it balances urban agility with reasonable fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,587 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.5 mm × 82.0 mm | |
| Power output | 66 kW (90 PS) @ 5,500 rpm | |
| Torque | 135 Nm @ 3,000 rpm | |
| Fuel system | Bosch Motronic MP5.2 multi-point injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven (requires periodic replacement) | |
| Oil type | PSA B71 2290 (SAE 10W‑40) | |
| Dry weight | 110 kg |
The DOHC 16-valve design provides crisp throttle response ideal for city driving but requires strict adherence to 60,000 km timing belt replacement intervals to prevent catastrophic engine failure. Using oil meeting PSA B71 2290 specification is critical to protect camshaft lobes from premature wear, a known issue documented in Technical Note 9812 A. The Bosch Motronic system is generally robust but sensitive to low-quality fuel and faulty sensors. Ignition coils and HT leads are common wear items after 100,000 km.
Oil Specs: Requires PSA B71 2290 specification oil (Peugeot Service Manual 9812). ACEA A2/B2 is the minimum acceptable standard.
Emissions: Euro 2 certification applies to all production years (VCA Type Approval #VCA/EMS/1011).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model applications (Peugeot Group PT-1999).
Peugeot Technical Information System: Docs 9812, 9812 A
VCA Type Approval Database (VCA/EMS/1011)
ISO 1585: Road vehicles — Engine test code — Net power
The Peugeot THY (DK5ATE) was used across PSA Group's PF1 and PF2 platforms with transverse mounting and shared with Citroën. This engine received minor ECU mapping variations between models-for instance, slightly different torque curves in the 206 versus the 306-but core mechanical components remain interchangeable. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, just below the exhaust manifold (Peugeot TIS Doc. 9812). The 8th VIN digit typically corresponds to the engine type ('Y' for THY in many PSA applications). Visually, it can be identified by its black plastic cam cover with "16V" embossed on it. Critical differentiation from the higher-output TU5JP engine: The THY (DK5ATE) has a lower compression ratio (9.7:1 vs 10.4:1) and a different ECU mapping, resulting in lower power output. Service parts, particularly gasket sets and sensors, are generally interchangeable within the TU5/DK5 family but verify part numbers against the specific engine code.
The THY (DK5ATE)'s primary reliability risk is exhaust camshaft lobe wear, with elevated incidence in high-mileage engines subjected to infrequent oil changes. Peugeot Technical Note 9812 A documents this issue, while general owner feedback highlights timing belt failures as a major cause of engine destruction. Extended service intervals and use of incorrect oil viscosity make adherence to the maintenance schedule critical.
Analysis derived from Peugeot technical bulletins (1998-2004) and general owner-reported failure data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT THY-DK5ATE.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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