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 com…
Production years 1998–2004 meet Euro 2 standards .
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 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.
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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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The THY can be reliable with meticulous maintenance, particularly regarding oil changes and timing belt replacement. Its main weakness is camshaft wear, which is often preventable with the correct oil. Many examples exceed 150,000 km with proper care, making it a robust engine for its time, though it demands more attention than later designs.
The most critical issues are exhaust camshaft lobe wear and timing belt failure. Other frequent problems include failing ignition coils, coolant temperature sensors, and oil leaks from the cam cover gasket. These are well-documented in Peugeot service notes.
This 1.6L engine was primarily used in the Peugeot 206 (1998-2004) and 306 (1998-2001). It was also shared with Citroën, powering the Saxo (1998-2003) and Xsara (1998-2000). It's a key engine in PSA's late-90s/early-2000s compact car lineup.
Yes, it has moderate tuning potential. Simple ECU remaps can yield 5-10 kW gains. More significant power is achievable with performance cams, exhaust, and intake upgrades. The bottom end is strong, but head work is usually needed for substantial gains. It was factory-tuned in higher-output variants like the TU5JP.
Real-world fuel economy is good. In a Peugeot 206, expect around 7.0 L/100km (40 mpg UK) in mixed driving. Highway cruising can return 5.0-5.5 L/100km (51-56 mpg UK). City driving will be higher, around 9.0 L/100km (31 mpg UK). Figures vary with driving style and vehicle condition.
Yes, absolutely. It is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing severe internal damage that often requires a complete engine rebuild or replacement. This makes the timing belt service non-negotiable.
Peugeot specifies oil meeting the PSA B71 2290 standard. A high-quality 10W-40 semi-synthetic or fully synthetic oil is recommended. Using the correct specification is crucial to prevent camshaft wear. Change intervals should not exceed 10,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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